[docs] make the explanation a separate page

[odow]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.62%. Comparing base (0032eb7) to head (da38215).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #217   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files           9        9           
  Lines        1882     1882           
=======================================
  Hits         1875     1875           
  Misses          7        7           

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