fixed sidebar content hidden issue

[mdabdulraheem]

Implemented a fix for sidebar content being hidden when overflowed issue.

Reference Issues

#609

Changes Made:

1. Added a custom.css file inside docs/_static folder
2. Added css style changes for sidebar in custom.css

[codecov-io]

Codecov Report

Merging #610 (530145c) into master (b418af4) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #610   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         1575      1575           
  Branches       284       284           
=========================================
  Hits          1575      1575           

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[miguelgrinberg]

Thank you!