core: disabling cachew through CACHEW_DISABLE env

[purarue]

went with fnmatch since I think that would be nicest to work with in $PATH environment variables, though feel free to suggest something else if you think it's better.

https://docs.python.org/3/library/fnmatch.html

[purarue]

If you think this is fine, will add some docs

[karlicoss]

hmm test_concurrent_writes[file] failed, but it's not cause of your changes -- I retried the CI. Thought I fixed that but apparently not =/

[karlicoss]

Thanks, looks neat! Up to you if you wanna add docs now, or we could give it a bit more testing first?

[purarue]

Added it into the doc/ folder now for, can move it into the ipynb file later yeah

[purarue]

alright should be good... I should really figure out some way to preview the .md files locally 😅

Edit: purarue/dotfiles@d5c2d43