DOC v0.30 part 1 (index, dev, install, quickstart, changelog)

[VarIr]

Closes #92.

TODO: docs/documentation folder

[codecov]

Codecov Report

Merging #106 (fd76672) into main (ecc529d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #106   +/-   ##
=======================================
  Coverage   94.83%   94.83%           
=======================================
  Files          33       33           
  Lines        2516     2516           
  Branches      311      311           
=======================================
  Hits         2386     2386           
  Misses        100      100           
  Partials       30       30           

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