Update docs

[ablaom]

Re-write the obs paragraph in index.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.75%. Comparing base (011006f) to head (b17f7de).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   97.75%   97.75%           
=======================================
  Files           9        9           
  Lines          89       89           
=======================================
  Hits           87       87           
  Misses          2        2           

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