Update Kafka Documentation links

[nbellol]

Done

• update doc links for kafka documentation to reflect migration to canonical.com
• update redirects.yaml to reflect migration of kafka docs to canonical.com

QA

• Open the DEMO
• Alternatively, check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8002/
• Run through the following QA steps
• [List additional steps to QA the new features or prove the bug has been resolved]

Issue / Card

Fixes #

Screenshots

[if relevant, include a screenshot]

[webteam-app]

Demo

Jenkins

demos.haus

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.48%. Comparing base (2425b98) to head (9410cde).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2768   +/-   ##
=======================================
  Coverage   77.48%   77.48%           
=======================================
  Files          16       16           
  Lines        2061     2061           
=======================================
  Hits         1597     1597           
  Misses        464      464           

Flag	Coverage Δ
python	77.48% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull request overview

This PR updates Apache Kafka-related documentation links across the marketing pages and navigation, reflecting the documentation’s move from documentation.ubuntu.com to canonical.com.

Changes:

• Updated CTA/documentation links in Kafka templates to point at https://canonical.com/data/kafka/docs.
• Updated Kafka “Docs” entry in secondary-navigation.yaml to the new documentation location.
• Updated redirects.yaml so legacy /data/docs/kafka/iaas... URLs redirect to the new canonical.com docs location.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
templates/data/kafka/what-is-kafka.html	Updates the “Try Charmed Kafka” CTA link to the new docs location.
templates/data/kafka/index.html	Updates multiple docs links (CTA + in-page link) to the new canonical.com docs URLs.
secondary-navigation.yaml	Updates Kafka secondary nav “Docs” link to the new docs location.
redirects.yaml	Redirects old Kafka IaaS docs paths to the canonical.com docs path.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[petesfrench]

This technically redirects to https://canonical.com/data/kafka/docs/4/how-to/deploy/

[petesfrench]

LGTM, just one minor comment