Purge unreferenced image files

[abrock]

Here is a list of file not referenced by any file in the repository, found by this script and cross-checked against a complete download of raumzeitlabor.de.

A lot of files are scaled versions of large images used by Wordpress but not used by the current setup. Purging these from the repo history would free roughly 95,448,311 bytes.

The list still needs work, as there are false positives in the list, e.g. else.png which is definitely used but only referenced via something I didn't trace down yet (CSS|JS?). It might be safe to purge every listed file within assets/uploads but I can't guarantee that atm.

[elsbrock]

Interesting. Most of the images in assets/uploads I'd assume I just copied with the last commit. So before doing any other commit, let's get rid of them and do a push --force to decrease the repo size.

The stuff in assets/avatars is referenced by the blogpost template in app/_includes/blogpost.html and depends on the username that is given in the YAML frontmatter.

[tabascoeye]

@abrock want to restart this effort on a branch with a PR? (those get built and deployed, so you can see if the website still works...)