Optimising Sidenav load time

[mohini-crl]

JIRA - https://cockroachlabs.atlassian.net/browse/DOC-11103

Docs Sidenav Load Time Improvement for "All Releases" Page

What Changed

1. Split "All Releases" Page:

   • Implemented a new structure to divide the "All Releases" page into two sections:
     • Supported Releases: Displays only the currently supported versions to reduce clutter and improve focus.
     • Unsupported Releases: Moved the remaining,unsupported releases to a separate page to handle the larger dataset efficiently.

2. Enhanced Performance:

   • Reduced the number of releases rendered on the primary "All Releases" page, significantly improving load time and usability.

Why

• Performance Optimization: The previous implementation of the "All Releases" page rendered too many entries, causing slower load times
• Improved Usability: Splitting the content allows users to find relevant information faster and avoid unnecessary scrolling through unsupported versions.

[github-actions]

Files changed:

• src/current/_data/supported_versions.csv
• src/current/_data/unsupported_versions.csv
• src/current/_includes/sidebar-all-releases.json
• src/current/_includes/sidebar-releases.json
• src/current/advisories/a48860.md
• src/current/cockroachcloud/alerts-page.md
• src/current/js/customscripts.js
• src/current/releases/index.md
• src/current/releases/release-support-policy.md
• src/current/releases/unsupported-versions.md

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