GUI Tweaks

[vkbo]

This PR includes:

• Updates to package warnings, adding clickable links. This addresses issue Unclear warning about escaped unicode in LaTeX export #85.
• Modified some of the initial configuration settings for the editor. Fixed width and justified text is now off by default.
• Removed numbers from the recent projects menu entry. They served no purpose beyond debugging.
• Updated readme.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@163465d). Click here to learn what that means.
The diff coverage is 77.77%.

@@            Coverage Diff            @@
##             master      #86   +/-   ##
=========================================
  Coverage          ?   62.95%           
=========================================
  Files             ?       42           
  Lines             ?     6489           
  Branches          ?        0           
=========================================
  Hits              ?     4085           
  Misses            ?     2404           
  Partials          ?        0

Impacted Files	Coverage Δ
nw/gui/mainmenu.py	93.4% <100%> (ø)
nw/gui/export.py	11.72% <100%> (ø)
nw/config.py	92.49% <100%> (ø)
nw/constants.py	100% <100%> (ø)
nw/common.py	94.8% <20%> (ø)

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