Documentation

[vkbo]

Added a menu entry to open the documentation, and added a lot of information in a html file.

[codecov-io]

Codecov Report

Merging #27 into master will increase coverage by <.01%.
The diff coverage is 85.41%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   83.04%   83.05%   +<.01%     
==========================================
  Files          26       26              
  Lines        3858     3907      +49     
==========================================
+ Hits         3204     3245      +41     
- Misses        654      662       +8

Impacted Files	Coverage Δ
nw/gui/mainmenu.py	95.54% <100%> (+0.08%)	⬆️
nw/theme.py	86.58% <100%> (+0.33%)	⬆️
nw/config.py	91.78% <100%> (+0.03%)	⬆️
nw/gui/winmain.py	71.13% <54.54%> (-1.13%)	⬇️
nw/gui/docviewer.py	86.15% <81.81%> (-13.85%)	⬇️
nw/gui/doceditor.py	69.08% <96.87%> (+2.53%)	⬆️

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