chore: Remove slugify library

packages/backend/package.json

@@ -69,7 +69,6 @@
     "prettier": "^2.5.1",
     "raw-body": "^2.5.2",
     "showdown": "^2.1.0",
-    "slugify": "^1.6.6",
     "uuid": "^9.0.1",
     "winston": "^3.7.1",
     "xmlrpc": "^1.3.2"

packages/backend/yarn.lock

@@ -4177,11 +4177,6 @@ simple-update-notifier@^1.0.7:
   dependencies:
     semver "~7.0.0"
 
-slugify@^1.6.6:
-  version "1.6.6"
-  resolved "https://registry.yarnpkg.com/slugify/-/slugify-1.6.6.tgz#2d4ac0eacb47add6af9e04d3be79319cbcc7924b"
-  integrity sha512-h+z7HKHYXj6wJU+AnS/+IH8Uh9fdcX1Lrhg1/VMdf9PwoBQXFcXiAdsy2tSK0P6gKwJLXp02r90ahUCqHk9rrw==
-
 smart-buffer@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/smart-buffer/-/smart-buffer-4.2.0.tgz#6e1d71fa4f18c05f7d0ff216dd16a481d0e8d9ae"