Add toggle button for notifier

[shokada]

No description provided.

[codecov-io]

Codecov Report

Merging #258 into master will increase coverage by 0.01%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   47.11%   47.12%   +0.01%     
==========================================
  Files          54       55       +1     
  Lines        2630     2642      +12     
==========================================
+ Hits         1239     1245       +6     
- Misses       1391     1397       +6     

Impacted Files	Coverage Δ
promgen/models.py	28.64% <0.00%> (-0.08%)	⬇️
promgen/urls.py	94.44% <ø> (ø)
promgen/views.py	47.92% <28.57%> (-0.20%)	⬇️
promgen/forms.py	92.45% <100.00%> (ø)
promgen/migrations/0018_sender_enabled.py	100.00% <100.00%> (ø)
promgen/tasks.py	46.06% <100.00%> (ø)

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[kfdm]

Looks good. Thanks!