Split code into cargo workspaces (#67)

More fixes

- fixed docker builds
- fixed mentions regex test
- fixed DATABASE_URL stuff
- change schema path in diesel.toml

Address review comments

- add jsonb column back into activity table
- remove authors field from cargo.toml
- adjust LEMMY_DATABASE_URL env var usage
- rename all occurences of LEMMY_DATABASE_URL to DATABASE_URL

Decouple utils and db

Split code into cargo workspaces

Co-authored-by: Felix Ableitner <[email protected]>
Reviewed-on: https://yerbamate.dev/LemmyNet/lemmy/pulls/67

package.json

@@ -70,7 +70,7 @@
   "engineStrict": true,
   "husky": {
     "hooks": {
-      "pre-commit": "cargo clippy --manifest-path ../server/Cargo.toml --all-targets --all-features -- -D warnings && lint-staged"
+      "pre-commit": "cargo clippy --manifest-path ../server/Cargo.toml --all-targets --workspace -- -D warnings && lint-staged"
     }
   },
   "lint-staged": {