Docs - Sandpack configuration

[piotrpospiech]

• configured basic Sandpack setup
• created first example - "basic usage". It is more a template for us to create other examples
• removed password from "getting started/basic usage" as input wasn't type of password and I didn't want to complicate this example with passing custom props
• added .vscode/settings.json to change default formatter from prettier to mdx. Prettier breaks formatting in template literals in mdx files
• removed mdx files from prettier configs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.53%. Comparing base (f751fcb) to head (e1a97e1).
Report is 1 commits behind head on docs.

Additional details and impacted files

@@           Coverage Diff           @@
##             docs    #1386   +/-   ##
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  Coverage   95.53%   95.53%           
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  Files         175      175           
  Lines        2867     2867           
  Branches      773      773           
=======================================
  Hits         2739     2739           
  Misses         59       59           
  Partials       69       69           

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