Improved README

[dorpvom]

With @jstucke

• Updated information in README
• Restructered README for better navigation and clarity
• Added up-to-date motivation section at the top

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.90%. Comparing base (86a6b3f) to head (f54a46a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1303      +/-   ##
==========================================
- Coverage   91.94%   91.90%   -0.04%     
==========================================
  Files         377      376       -1     
  Lines       22295    21038    -1257     
==========================================
- Hits        20499    19336    -1163     
+ Misses       1796     1702      -94     

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