fix: Refactor static file server handler and logger

[jrschumacher]

Refactor the code in staticFileServerHandler.go and logger.go to improve code organization and readability. The changes include:

• Move the logger related functions to a separate file, logger.go, for better separation of concerns.
• Rename the StaticFilesHandler function to NewStaticFilesHandler to follow the Go convention for constructor functions.
• Extract the ServeHTTP method from the StaticFilesHandler function and move it to the StaticFilesHandler struct to improve encapsulation.
• Clean up the code by removing unused imports and variables.

This commit improves the maintainability and readability of the codebase.

[codecov]

Codecov Report

Attention: Patch coverage is 86.84211% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.13%. Comparing base (b5d1de7) to head (b111580).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
staticFileServerHandler.go	84.37%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   80.98%   83.13%   +2.15%     
==========================================
  Files           3        4       +1     
  Lines         163      166       +3     
==========================================
+ Hits          132      138       +6     
+ Misses         18       15       -3     
  Partials       13       13              

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