Move birthday calendar settings to server component

[cneukom]

In combination with nextcloud/server#33397, this PR potentially closes #130.

[codecov]

Codecov Report

Merging #4402 (b01c6cb) into main (5e87d47) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

❗ Current head b01c6cb differs from pull request most recent head b4fadcc. Consider uploading reports for the commit b4fadcc to get more accurate results

@@             Coverage Diff              @@
##               main    #4402      +/-   ##
============================================
- Coverage     29.42%   29.36%   -0.06%     
  Complexity      330      330              
============================================
  Files           220      220              
  Lines          7702     7685      -17     
  Branches       1019     1016       -3     
============================================
- Hits           2266     2257       -9     
+ Misses         5436     5428       -8     

Flag	Coverage Δ
javascript	20.43% <0.00%> (-0.09%)	⬇️
php	68.80% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/AppNavigation/Settings.vue	0.00% <0.00%> (ø)
src/services/caldavService.js	31.48% <ø> (-0.10%)	⬇️
src/store/settings.js	93.75% <ø> (-0.49%)	⬇️

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