feat(config): create config file on first write if it doesn't exist

[JosephKav]

Argus can now start when no config.yml exists (e.g. docker bind mount of a fresh dir). Saves will create the config.yml so any restarts will persists the data

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.71%. Comparing base (0ee6b1d) to head (1dfa211).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
+ Coverage   99.71%   99.71%   +0.01%     
==========================================
  Files         204      204              
  Lines       12946    12948       +2     
==========================================
+ Hits        12908    12910       +2     
  Misses         33       33              
  Partials        5        5              

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[github-actions]

✅ Playwright Test Results

	Count
✅ Passed	317
❌ Failed	0
🔄 Flaky	2
⏭️ Skipped	4

Duration: 1106.3s

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