modularize tutorials

[bendichter]

include links to API

[codecov[bot]]

Codecov Report

Merging #303 (b339fae) into master (276e462) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   83.16%   83.16%           
=======================================
  Files         119      119           
  Lines        4177     4177           
=======================================
  Hits         3474     3474           
  Misses        703      703           

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