fix: Special sidebar behaviour for pages without sidebar

[Utkarsh-123github]

What kind of change does this PR introduce?
Through this PR, I have introduced a special sidebar behaviour for some pages that are not mentioned in the sidebar.

• For https://json-schema.org/md-style-guide I have removed the sidebar as per our previous discussion.
• For the release notes subsections I have marked the release notes item in the sidebar.

Issue Number:

• Closes ✨ Enhancement: Special sidebar behaviour for pages for pages without sidebar item #1011

Screenshots/videos:
Note: Please unmute the video for better understanding of the implementation.

2025-07-05.15-30-42.mp4

If relevant, did you update the documentation?
No

Summary
Fixes #1011

Does this PR introduce a breaking change?
No

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

[github-actions]

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Name	Status	Preview	Last Commit
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d585a99) to head (0b92ccb).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1760   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          548       548           
  Branches       158       158           
=========================================
  Hits           548       548           

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[Utkarsh-123github]

Hi @benjagm , through this PR the main issue #1011 is resolved and is ready to reviewed and further merged. Kindly review at your convenience.

I have observed some of the issues related to Responsiveness and text visibility of the md-style-guide which were existing earlier too and was beyond the scope of the parent issue. So I have created a separate issue which will address it. #1759

Thank You!