Swap out gedit for pluma

[wmww]

Mostly testing if this works in CI

[codecov[bot]]

Codecov Report

Merging #35 (7ae55c3) into main (25df7c0) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   47.81%   47.81%           
=======================================
  Files           7        7           
  Lines         458      458           
  Branches       49       49           
=======================================
  Hits          219      219           
  Misses        226      226           
  Partials       13       13           

Impacted Files	Coverage Δ
frame/apps.py	84.37% <100.00%> (ø)

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[wmww]

Seems like this is the most straightforward way to deal with gedit waiting on d-bus

Fixes #22 (by taking gedit out of the picture entirely)