Removed Spontit (no longer in service upstream)

[caronc]

Description:

Related issue (if applicable): #1026

Spontit has been reported as being officially gone/offline. Removing plugin from Apprise

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eca2db5) 99.27% compared to head (8d086ca) 99.27%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1034      +/-   ##
==========================================
- Coverage   99.27%   99.27%   -0.01%     
==========================================
  Files         136      135       -1     
  Lines       17668    17557     -111     
  Branches     3603     3583      -20     
==========================================
- Hits        17540    17429     -111     
  Misses        119      119              
  Partials        9        9              

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