Sphinx documentation for 0.8

[MateuszKubuszok]

TODO:

• change Gitter links to GitHub Discussions
• finish "Migration to 0.8" section
• finish "Libraries with smart constructors" section
• finish "Protocol Buffers" section
• finish "Debugging macros" section
  • link to this section in scaladocs
• finish "Known issues and limitations" section
• wire new sections in ToC

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8e9f5c1) 87.94% compared to head (c2ce727) 87.94%.
Report is 2 commits behind head on scala-3.

Additional details and impacted files

@@           Coverage Diff            @@
##           scala-3     #339   +/-   ##
========================================
  Coverage    87.94%   87.94%           
========================================
  Files           80       80           
  Lines         1676     1676           
  Branches       123      136   +13     
========================================
  Hits          1474     1474           
  Misses         202      202           

Files Changed	Coverage Δ
...cala-2/io/scalaland/chimney/dsl/PatcherUsing.scala	66.66% <ø> (ø)
...main/scala/io/scalaland/chimney/dsl/FlagsDsl.scala	68.75% <ø> (ø)

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All questions were addressed and a new review was requested