Use mix() for loading static files.

Use `mix()` in blade for loading static files in order to generated hashed one on production.

https://laravel.com/docs/9.x/helpers#method-mix

Inspect the Blade templates for static-file references and read Laravel's `mix()` helper documentation at the linked URL. Update the relevant references so production loads hashed assets, then verify that the generated filenames resolve correctly in the rendered pages.

Written by the indexing model from the issue text.