Docs improvement

[rlopezcoto]

• Move to automodapi instead of automodule
• Add missing scripts documentation
• Modify datachecks docstrings for them to properly appear in the documentation

[codecov]

Codecov Report

Merging #851 (5b848e7) into master (b986ac4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #851   +/-   ##
=======================================
  Coverage   84.98%   84.98%           
=======================================
  Files          71       71           
  Lines        5575     5575           
=======================================
  Hits         4738     4738           
  Misses        837      837           

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