Fix image cache resolve 302

[melroy89]

• Keep 302 (== default) to avoid breaking dev env or Docker setup.
• Explain you can set this value to 301 if you are behind Nginx (assuming it's correctly configured)
  • Update docs
• Reorder liip config
• Add some defaults. Incl. 90 quality on default_filter_set_settings level, so no need to repeat it in filter_sets.
• Update liip package
• composer update

Before (302, not getting cached):

After (301, getting cached by the browser, Firefox):

EDIT: Tested live on https://kbin.melroy.org for more than 24 hours in the past already with 301 behind nginx, without any issues :)

[melroy89]

I restored to default back to 302 to avoid issues with devenv or Docker or Caddy. However, I did add this option/setting to the configuration + inline comment in the yaml file + admin guide documentation.

[nobodyatroot]

No issues from what I can tell, testing live on kbin.run and everything appears normal.