Docs: v7 announcement (for v6 branch)

[danielchalmers]

Description

#8479

How Has This Been Tested?

visually

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[danielchalmers]

@henon Maybe we collect a small number of bug fixes to backport then release them together with this for v6.19.2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.85%. Comparing base (bf2e9ef) to head (ce65b52).

Additional details and impacted files

@@            Coverage Diff             @@
##               v6    #9028      +/-   ##
==========================================
+ Coverage   88.82%   88.85%   +0.03%     
==========================================
  Files         416      394      -22     
  Lines       12356    12291      -65     
  Branches     2458     2443      -15     
==========================================
- Hits        10975    10921      -54     
+ Misses        850      843       -7     
+ Partials      531      527       -4     

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[henon]

Thanks