Set Access-Control-Allow-Origin: * header in all responses

[jwodder]

Closes #110.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 45.96%. Comparing base (637d82b) to head (9bda836).

Files	Patch %	Lines
src/main.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
- Coverage   46.01%   45.96%   -0.05%     
==========================================
  Files          24       24              
  Lines        3710     3714       +4     
==========================================
  Hits         1707     1707              
- Misses       2003     2007       +4     

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