Remove-docs-build-warnings

[liopeer]

Description

• reduces warnings from 46 to 13
• all remaining warnings are in the api subpackage
• additionally adds another make command for a clean docs build – otherwise some warnings will not be shown due to cache-ing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.24%. Comparing base (22464e3) to head (31c932c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1797   +/-   ##
=======================================
  Coverage   85.24%   85.24%           
=======================================
  Files         163      163           
  Lines        6833     6833           
=======================================
  Hits         5825     5825           
  Misses       1008     1008           

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