this time, took some adjusting to get element to build again

this is the rust tool used by the french ministry for
transport (deployed at https://transport.data.gouv.fr/validation),
patched to not include the server mode it usually has (i don't want to
constantly compile another copy of actix-web)

since schildichat-web has essentially been unmaintained for a while now,
i guess i don't really have any choice here.

I've tried to at least hack a little css into my element so it won't
bother me too much (mostly making UI elements smaller & changing some
colours). However, it turns out they do UI calculations in javascript
which just make hard assumptions over values set in the css, and so far
I've not succeeded in fixing these.

Das ist doch wirklich alles Unsinn in diesem Ökosystem …

 - pkgs/ should now also contain all package overrides
 - pkgs/patches/ now contains all patches
 - nix flake info succeeds again
 - still not sure what to do about scripts
 - services which are not used should not be kept around this long