fix: Rollback to exp slog repository

This is done until go1.21 hits alpine repository.

fix: Adjust post endpoint

feat: Add option to download file

feat: Migrate from logrus to slog

ref: Remove ggen entry

I have no intention of going further with that.

feat: Simplify mosaic

The old implementation was not good and would render the list on mobile
in the wrong order

feat: Add detail page

fix: Oder by correct field

Before the order was not taking the `date_shot` into consideration.

chore: Update readme readmap

feat: Add admin control

Now only admins can access settings.