docs: update docus to 0.8.x

[pi0]

Due to build issues, docus was pinned to 0.5.x

Current issues:

• Home is broken
• Layout resolution error?

[pi0]

/cc @Tahul @farnabaz Can you please have a look?

[codecov-commenter]

Codecov Report

Merging #349 (84b3b41) into main (3d11b87) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #349   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files          26       26           
  Lines         618      618           
  Branches      194      194           
=======================================
  Hits          365      365           
  Misses        253      253           

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[farnabaz]

• Landing template is not available we need to use page template
• Components syntax is updated and for inline component should use single colon (double colon for inline components does not work)
• Also I've updated docs to simplify code-group usages

Pushed the patch @pi0

[pi0]

Thanks @farnabaz. There are some runtime issues (sidebar toggle seems broken). Will report to docus repo.