remove documentation, metadata, etc

This drastically reduces the maintenance burden.

You may notice the `CODE_OF_CONDUCT.md` is deleted here. This is because
I don't feel like updating the relevant parts and I don't think this
will ever actually have a community build around it. If that changes for
some reason, I'm not opposed to adding a code of conduct again.

bin/nix-build-and-cache

@@ -11,14 +11,14 @@ nix build "$@"
 if [ ! -z ${ATTIC_TOKEN+x} ]; then
     nix run --inputs-from . attic -- \
         login \
-        conduit \
-        "${ATTIC_ENDPOINT:-https://nix.computer.surgery/conduit}" \
+        "$ATTIC_SERVER" \
+        "$ATTIC_ENDPOINT" \
         "$ATTIC_TOKEN"
 
     # Push the target installable and its build dependencies
     nix run --inputs-from . attic -- \
         push \
-        conduit \
+        "$ATTIC_SERVER:$ATTIC_CACHE" \
         "$(nix path-info "$INSTALLABLE" --derivation)" \
         "$(nix path-info "$INSTALLABLE")"
 else