feat(frontend): refactor and modernize welcome page (#3614)

* feat(frontend): refactor and modernize welcome page - also fixes navbar issue.

Closes: #1533

* fix(frontend): lint issues & use standard variables instead of the constants from error.vue

* fix(frontend): remove creator count as it's not a count of all users

* fix(frontend): lang reshuffle

* feat: rinthbot

* fix: lint issues

* fix: sizing of bot on mobile & scss cleanup for error.vue

* fix: lint issues

* fix: ui lint

apps/frontend/src/locales/en-US/index.json

@@ -159,7 +159,7 @@
     "message": "Subscribe to updates about Modrinth"
   },
   "auth.welcome.description": {
-    "message": "Thank you for creating an account. You can now follow and create projects, receive updates about your favorite projects, and more!"
+    "message": "You’re now part of the awesome community of creators & explorers already building, downloading, and staying up-to-date with amazing mods."
   },
   "auth.welcome.label.tos": {
     "message": "By creating an account, you have agreed to Modrinth's <terms-link>Terms</terms-link> and <privacy-policy-link>Privacy Policy</privacy-policy-link>."