Minor Docs Fixes

[1b15]

• removed unused old plugin (mkdocs-include-markdown-plugin) from docs pipeline
• fixed aln.png image not being displayed in docs/ex0
• fixed minor typos

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (96708f6) 93.44% compared to head (386f8c7) 93.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
+ Coverage   93.44%   93.58%   +0.13%     
==========================================
  Files          54       54              
  Lines        4452     4452              
==========================================
+ Hits         4160     4166       +6     
+ Misses        292      286       -6     

Flag	Coverage Δ
unittests	93.58% <ø> (+0.13%)	⬆️

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see 1 file with indirect coverage changes

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