Update common_settings.py for precompressing static files #2411

[ShaunTheProgrammer]

Fixes #2411

STATICFILES_STORAGE:

We specify whitenoise.storage.CompressedManifestStaticFilesStorage as the storage backend. This storage class automatically compresses static files during the collectstatic process, creating .gz (gzip) and .br (Brotli) versions of each file.
WHITENOISE_USE_BROTLI:

This setting enables Brotli compression for static files. Brotli typically achieves better compression ratios compared to gzip, so this helps with performance.
COMPRESS_PRECOMPRESS_GZIP and COMPRESS_PRECOMPRESS_BROTLI:

These ensure that both .gz (gzip) and .br (Brotli) compressed versions of static files are created during the collectstatic process.
Serving Precompressed Files:

WhiteNoise will automatically serve precompressed versions of static files if the client supports the respective compression formats (i.e., Brotli or gzip). This reduces the load on the webserver (Caddy) since it doesn’t need to compress responses dynamically.
Caching with WHITENOISE_MAX_AGE:

Static files are served with a cache-control header that allows browsers to cache them for one year, reducing the load on your server and improving performance.
By using WhiteNoise in this manner, we ensure that static files are compressed during the deployment process (e.g., with collectstatic) and served efficiently with support for both Brotli and gzip without requiring the webserver (Caddy) to compress them on the fly.
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[pavish]

@ShaunTheProgrammer Thanks for the PR!

Our team is overextended at the moment since we're working towards our Beta release. It might take a few weeks before I get to reviewing the PR.