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

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

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Additional details and impacted files

```diff @@ 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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