docs: Improve README Quickstart section and add dark mode logo (#10358)

* Improve README Quickstart section and reorganize installation options

- Add prominent Desktop download section before Quickstart
- Remove $ symbols from shell commands to fix copy button functionality
- Add clear 'Run from source' option with make run_cli for developers
- Improve Docker installation instructions with usage details
- Move security warnings to after installation options for better flow
- Remove redundant star/issues badges

These changes address common user confusion when trying to run Langflow,
especially for developers who clone the repo first and then struggle with
the package installation instructions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add dark mode logo support

- Added picture element for automatic dark/light mode logo switching
- Dark mode shows blue background logo, light mode shows black logo

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Final README improvements

- Made 'Other install options' a proper section with emoji
- Updated deployment section with rocket emoji
- Fixed single-line formatting for subsections
- Added new star animation gif
- Changed 'tool' to 'platform' in description

* Improve Desktop download section messaging

- Made text more concise and action-oriented
- Changed download emoji from arrow to inbox
- Removed redundant 'built-in' and bold formatting
- Cleaner parenthetical for OS availability

* Revise README for Langflow Desktop and deployment info

Updated sections for clarity and added details about Langflow Desktop and deployment options.

* Revert star gif to GitHub attachment URL

Testing if local file path issue or markdown previewer issue

* Apply suggestion from @mendonk

* Apply suggestion from @mendonk

* Apply suggestion from @mendonk

* Apply suggestion from @mendonk

* readme-changes

* Apply suggestion from @mendonk

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Mendon Kissling <59585235+mendonk@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

Author: 4 people

README.md

@@ -1,26 +1,19 @@
 <!-- markdownlint-disable MD030 -->
 
-![Langflow logo](./docs/static/img/langflow-logo-color-black-solid.svg)
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="./docs/static/img/langflow-logo-color-blue-bg.svg">
+  <img src="./docs/static/img/langflow-logo-color-black-solid.svg" alt="Langflow logo">
+</picture>
 
 [![Release Notes](https://img.shields.io/github/release/langflow-ai/langflow?style=flat-square)](https://github.com/langflow-ai/langflow/releases)
 [![PyPI - License](https://img.shields.io/badge/license-MIT-orange)](https://opensource.org/licenses/MIT)
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/langflow?style=flat-square)](https://pypistats.org/packages/langflow)
-[![GitHub star chart](https://img.shields.io/github/stars/langflow-ai/langflow?style=flat-square)](https://star-history.com/#langflow-ai/langflow)
-[![Open Issues](https://img.shields.io/github/issues-raw/langflow-ai/langflow?style=flat-square)](https://github.com/langflow-ai/langflow/issues)
 [![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langflow-ai.svg?style=social&label=Follow%20%40Langflow)](https://twitter.com/langflow_ai)
 [![YouTube Channel](https://img.shields.io/youtube/channel/subscribers/UCn2bInQrjdDYKEEmbpwblLQ?label=Subscribe)](https://www.youtube.com/@Langflow)
 [![Discord Server](https://img.shields.io/discord/1116803230643527710?logo=discord&style=social&label=Join)](https://discord.gg/EqksyE2EX9)
 [![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/langflow-ai/langflow)
 
-> [!CAUTION]
-> - Langflow versions 1.6.0 through 1.6.3 have a critical bug where `.env` files are not read, potentially causing security vulnerabilities. **DO NOT** upgrade to these versions if you use `.env` files for configuration. Instead, upgrade to 1.6.4, which includes a fix for this bug.
-> - Windows users of Langflow Desktop should **not** use the in-app update feature to upgrade to Langflow version 1.6.0. For upgrade instructions, see [Windows Desktop update issue](https://docs.langflow.org/release-notes#windows-desktop-update-issue).
-> - Users must update to Langflow >= 1.3 to protect against [CVE-2025-3248](https://nvd.nist.gov/vuln/detail/CVE-2025-3248)
-> - Users must update to Langflow >= 1.5.1 to protect against [CVE-2025-57760](https://github.com/langflow-ai/langflow/security/advisories/GHSA-4gv9-mp8m-592r)
->
-> For security information, see our [Security Policy](./SECURITY.md) and [Security Advisories](https://github.com/langflow-ai/langflow/security/advisories).
-
-[Langflow](https://langflow.org) is a powerful tool for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
+[Langflow](https://langflow.org) is a powerful platform for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
 
 ## ✨ Highlight features
 
@@ -33,6 +26,13 @@
 - **Observability** with LangSmith, LangFuse and other integrations.
 - **Enterprise-ready** security and scalability.
 
+## 🖥️  Langflow Desktop
+
+Langflow Desktop is the easiest way to get started. It includes dependency management and automatic updates.
+Available for Windows and macOS.
+
+[📥 Download Langflow Desktop](https://www.langflow.org/desktop)
+
 ## ⚡️ Quickstart
 
 ### Install locally (recommended)
@@ -41,34 +41,53 @@ Requires Python 3.10–3.13 and [uv](https://docs.astral.sh/uv/getting-started/i
 
 #### Install
 
+From a fresh directory, run:
 ```shell
 uv pip install langflow -U
 ```
 
-Installs the latest Langflow package.
+The latest Langflow package is installed.
+For more information, see [Install and run the Langflow OSS Python package](https://docs.langflow.org/get-started-installation#install-and-run-the-langflow-oss-python-package).
 
 #### Run
 
+To start Langflow, run:
 ```shell
 uv run langflow run
 ```
 
-Starts the Langflow server at http://127.0.0.1:7860.
+Langflow starts at http://127.0.0.1:7860.
 
-That's it! You're ready to build with Langflow 🎉
+That's it! You're ready to build with Langflow! 🎉
 
-### Other install options
+## 📦 Other install options
 
-- [Docker](https://docs.langflow.org/deployment-docker)
-- [Desktop app](https://docs.langflow.org/get-started-installation#install-and-run-langflow-desktop)
+### Run from source
+If you've cloned this repository and want to contribute, run this command from the repository root:
+```shell
+make run_cli
+```
+For more information, see [DEVELOPMENT.md](./DEVELOPMENT.md).
 
-### Install from repo
+### Docker
+Start a Langflow container with default settings:
+```shell
+docker run -p 7860:7860 langflowai/langflow:latest
+```
+Langflow is available at http://localhost:7860/.
+For configuration options, see the [Docker deployment guide](https://docs.langflow.org/deployment-docker).
 
-If you're contributing or running from source, see [DEVELOPMENT.md](./DEVELOPMENT.md) for setup instructions.
+> [!CAUTION]
+> - Langflow versions 1.6.0 through 1.6.3 have a critical bug where `.env` files are not read, potentially causing security vulnerabilities. **DO NOT** upgrade to these versions if you use `.env` files for configuration. Instead, upgrade to 1.6.4, which includes a fix for this bug.
+> - Windows users of Langflow Desktop should **not** use the in-app update feature to upgrade to Langflow version 1.6.0. For upgrade instructions, see [Windows Desktop update issue](https://docs.langflow.org/release-notes#windows-desktop-update-issue).
+> - Users must update to Langflow >= 1.3 to protect against [CVE-2025-3248](https://nvd.nist.gov/vuln/detail/CVE-2025-3248)
+> - Users must update to Langflow >= 1.5.1 to protect against [CVE-2025-57760](https://github.com/langflow-ai/langflow/security/advisories/GHSA-4gv9-mp8m-592r)
+>
+> For security information, see our [Security Policy](./SECURITY.md) and [Security Advisories](https://github.com/langflow-ai/langflow/security/advisories).
 
-## 📦 Deployment
+## 🚀 Deployment
 
-Langflow is completely open source, and you can deploy it to all major clouds. To learn how to use Docker to deploy Langflow, see the [Docker deployment guide](https://docs.langflow.org/deployment-docker).
+Langflow is completely open source and you can deploy it to all major deployment clouds. To learn how to deploy Langflow, see our [Langflow deployment guides](https://docs.langflow.org/deployment-overview).
 
 ## ⭐ Stay up-to-date