Remove unused bootstrap npm package

The bootstrap dependency was never imported anywhere in the code. The
live site's styling actually comes from a static Bootswatch 3.3.7 file
(resources/bootstrap.min.css, based on Bootstrap 3) served directly by
Express/Vite, independent of the npm dependency graph. Leaving that
file untouched since it's the real, in-use stylesheet.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: FlandersBurger

package-lock.json

@@ -23,7 +23,6 @@
     "axios": "^1.18.1",
     "bcrypt-pbkdf": "^1.0.2",
     "bcryptjs": "^3.0.3",
-    "bootstrap": "^4.5.2",
     "bson": "^7.3.0",
     "bull": "^4.16.5",
     "chalk": "^4.1.2",