Update documentation and docs domain

[vivekjoshy]

Add more details to the documentation, fixes broken links and other little stuff. Also add a top level domain name for docs.

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I affirm the Developer Certificate of Origin
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and understand I am releasing the same under openskill.py's MIT license.

I certify the above statement is true and correct: @daegontaven

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (cc9590a) compared to base (4302ab9).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #73   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          573       573           
  Branches       139       139           
=========================================
  Hits           573       573           

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