Update Lab content and images for vertical nav (#1611)

Author: quietbits

docs/tools/lab/account.mdx

@@ -10,7 +10,7 @@ sidebar_position: 10
 
 ![Lab: Create Account](/assets/lab/lab-account-create.png)
 
-From the Lab’s top navigation, click on the "Account" link. You will land on the "Create Account Keypair" page, where you can generate a [keypair](../../learn/glossary.mdx#keypair) by following these steps:
+From the Lab’s main navigation, click on the "Account" link to expand sub-navigation. Click the "Create Account Keypair" page. Here you can generate a [keypair](../../learn/glossary.mdx#keypair) by following these steps:
 
 1. Make sure you are on the Stellar network for which you want to generate the keypair. You can see the current network in the upper right corner of the page. Click on dropdown to change the network (don’t forget to provide any necessary information). We will use Testnet network for this example.
 2. Click the "Generate keypair" button to create public and secret keys for an account. Save them someplace safe, even if they are used only for testing.
@@ -29,13 +29,13 @@ The Friendbot can be used for new account or accounts with balance under a start
 
 :::
 
-4. Optionally, to save the generated keypair, click the "Save Keypair" button. Enter the name in the pop-up and click the "Save" button to save the keypair in the browser's local storage. Click the "Saved Keypairs" link on the left-side menu to view saved keypairs. The save feature is available only on Testnet and Futurenet networks.
+4. Optionally, to save the generated keypair, click the "Save Keypair" button. Enter the name in the pop-up and click the "Save" button to save the keypair in the browser's local storage. Click the "Saved" link on the main menu to expand the submenu, then click on the "Keypairs" link to view saved keypairs. The save feature is available only on Testnet and Futurenet networks.
 
 ## [Fund Account](https://lab.stellar.org/account/fund)
 
 ![Lab: Fund Account](/assets/lab/lab-account-fund.png)
 
-If you already have a keypair you want to fund, go to the "Fund Account" page.
+If you already have a keypair you want to fund, go to the "Fund Account" page (under the "Account" item in the main menu).
 
 1. If you have generated a keypair on the "Create Account Keypair" page, you can use its public key by clicking the "Fill in the generated key" button. The button will be disabled if there is no keypair.
 2. You can always manually input a public key.

docs/tools/lab/api-explorer/horizon-endpoint.mdx

@@ -10,7 +10,7 @@ On August 1, 2024, the publicly accessible SDF-hosted Horizon had its historical
 
 Data on the Stellar ledger is organized into [resources](../../../data/apis/horizon/api-reference/resources): **Accounts, Assets, Claimable Balances, Effects, Ledgers, Liquidity Pools, Offers, Operations, Trades**, and **Transactions**. Each resource has multiple endpoints. Endpoints that aggregate ledger data (also known as [aggregations](../../../data/apis/horizon/api-reference/aggregations)) include resources like **Order Books, Paths, Trade Aggregations**, and **Fee Stats**.
 
-Stellar Lab's Horizon Endpoints lists each resource type in the side menu, allowing developers to interact with its respective endpoints.
+Stellar Lab's Horizon Endpoints lists each resource type in the menu, allowing developers to interact with its respective endpoints.
 
 ![Lab: Horizon Page](/assets/lab/horizon-endpoints.png)
 
@@ -353,7 +353,7 @@ Clicking the icon opens a modal. We recommend providing an identifiable name to
 
 ![Lab: Horizon - Modal](/assets/lab/horizon-save-modal.png)
 
-Saved endpoints are located at the top left of the side menu. They include requests for both the **RPC Methods** and **Horizon Endpoints**.
+Saved endpoints are located in the main menu under the "Saved" menu, "Requests" submenu. They include requests for both the **RPC Methods** and **Horizon Endpoints**.
 
 ![Lab: Horizon - Saved Requests Page](/assets/lab/horizon-saved-requests.png)
 

docs/tools/lab/api-explorer/rpc-methods.mdx

@@ -1,10 +1,10 @@
 # RPC Methods
 
-RPC methods are a set of functions that allow developers to interact directly with the Stellar network. You can learn more about all the RPC methods [here](../../../data/apis/rpc/api-reference/methods). The Lab provides an easy way to use these methods from the UI. To access the "RPC Methods" section, click on the "API Explorer" link in the main navigation, which will open a new page listing all RPC methods by name.
+RPC methods are a set of functions that allow developers to interact directly with the Stellar network. You can learn more about all the RPC methods [here](../../../data/apis/rpc/api-reference/methods). The Lab provides an easy way to use these methods from the UI. To access the "RPC Methods" items, click on the "API Explorer" link in the main navigation, then click the "RPC Methods" submenu link, which will open another submenu listing all RPC methods by name. Click on the method name to open that page.
 
 :::warning
 
-RPC URL is required to submit these methods. You can update or set the RPC URL in the network selector in the main navigation bar.
+RPC URL is required to submit these methods. You can update or set the RPC URL in the network selector in the top right corner.
 
 :::
 
@@ -30,7 +30,7 @@ The Stellar Lab allows you to share RPC methods with filled data. Simply click o
 
 ## Saved Requests
 
-You can save methods in the browser’s local storage by clicking the Save button (next to the Share button). Once you click that button, a modal will pop up, where you will need to enter the name and click save. To view your saved RPC methods in the Lab, click the "Saved Requests" link in the menu, then click the "RPC Methods" tab in the top right.
+You can save methods in the browser’s local storage by clicking the Save button (next to the Share button). Once you click that button, a modal will pop up, where you will need to enter the name and click save. To view your saved RPC methods in the Lab, click the "Saved" link in the main menu, then click the "Requests" submenu link. Then click the "RPC Methods" tab in the top right.
 
 :::info
 

docs/tools/lab/transactions.mdx

@@ -4,7 +4,7 @@
 
 ![Lab: Build Transaction](/assets/lab/lab-transactions-build.png)
 
-You can access the "Build Transaction" page by clicking the "Transactions" link in the Lab's top navigation. The transaction builder UI has helpful messages, links, and input validation to make learning how to build transactions on the Stellar network easier. There are three main sections: params, operations, and transaction validation (error or success).
+You can access the "Build Transaction" page by clicking the "Transactions" link in the Lab's main navigation. The transaction builder UI has helpful messages, links, and input validation to make learning how to build transactions on the Stellar network easier. There are three main sections: params, operations, and transaction validation (error or success).
 
 ### Params