[Merge] ~rkratky/ubuntu-governance-docs:docs-checks-update into ubuntu-governance-docs:main

[Robert Krátký]

Robert Krátký has proposed merging ~rkratky/ubuntu-governance-docs:docs-checks-update into ubuntu-governance-docs:main.

Commit message:
Update Sphinx config & fix content to pass docs checks


Requested reviews:
  Robie Basak (racb)

For more details, see:
https://code.launchpad.net/~rkratky/ubuntu-governance-docs/+git/ubuntu-governance-docs/+merge/483400

Update Sphinx config
   
* Update syntax to pass linter
* Add matrix.to to linkcheck ignore list
* Fix Launchpad URLs

Fix content to pass docs checks
    
* Switch spellcheck to US English
* Fix spelling mistakes
* Add exceptions to ignore list
* Fix/update links to pass linkcheck
* Fix headings to sentence case
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