Add a Release News section to the table of contents

[trbromley]

Context:

#5483 adds a new quickstart guiding users through the changes to op arithmetic. However, there are too many quickstarts in the table of contents.

Description of the Change:

• A new "Release news" section has been added to the table of contents, including the release notes, deprecations, and the op arithmetic update page.
• The new return types troubleshooting page has been removed [sc-66837]

Benefits:

A clearer distinction between quickstarts (guiding users to quickly get started with the library) and news/time-based pages (now called "Release news").

NB: Make many linux deprecation very loud and clear

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (9151477) to head (faceefa).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5563      +/-   ##
==========================================
- Coverage   99.69%   99.69%   -0.01%     
==========================================
  Files         410      412       +2     
  Lines       38278    38273       -5     
==========================================
- Hits        38161    38155       -6     
- Misses        117      118       +1     

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[isaacdevlugt]

Nice! Seems pretty logical to me to do this.

[Qottmann]

Is it intentional the resturns.rst page is deleted or did you forget to git add it?

Otherwise looks good to me 👍

[isaacdevlugt]

Is it intentional the resturns.rst page is deleted or did you forget to git add it?

Otherwise looks good to me 👍

@Qottmann this was intentional since it's been a good amount of time since that feature was released :)