Add auto-generated documentation

[rileyshahar]

This will resolve #4.

• [x] Configure sphinx
• [x] Auto-generate and host docs with readthedocs
• [X] Simplify contributor instructions
• [X] Add installation guide
• [X] Add more examples
• [X] Autogenerate CLI documentation (https://github.com/tiangolo/typer/issues/200)

[codecov[bot]]

Codecov Report

Merging #6 (5280b68) into main (bcfc8d3) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #6   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          230       231    +1     
  Branches        19        19           
=========================================
+ Hits           230       231    +1     

Impacted Files	Coverage Δ
src/aga/core.py	100.00% <ø> (ø)
src/aga/__init__.py	100.00% <100.00%> (ø)
src/aga/cli.py	100.00% <100.00%> (ø)
src/aga/loader.py	100.00% <100.00%> (ø)

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