feat: overhaul public landing page and backup tooling

backend/package.json

@@ -42,6 +42,7 @@
     "nodemailer": "7.0.5",
     "pg": "^8.16.3",
     "react-i18next": "^15.6.0",
+    "sanitize-html": "^2.17.0",
     "sharp": "0.34.3",
     "sqlite3": "^5.1.6",
     "uuid": "^11.1.0",
@@ -51,6 +52,7 @@
   "devDependencies": {
     "eslint": "^8.40.0",
     "jest": "^29.5.0",
+    "mock-fs": "^5.5.0",
     "nodemon": "^3.1.10",
     "supertest": "^6.3.3"
   }