Use a more robust slugify function

web-app/package-lock.json

@@ -9,7 +9,6 @@
       "version": "0.0.1",
       "dependencies": {
         "fast-diff": "1.3.0",
-        "github-slugger": "2.0.0",
         "highlight.js": "11.10.0",
         "isomorphic-dompurify": "2.14.0",
         "marked": "14.0.0",
@@ -2734,12 +2733,6 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
-    "node_modules/github-slugger": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/github-slugger/-/github-slugger-2.0.0.tgz",
-      "integrity": "sha512-IaOQ9puYtjrkq7Y0Ygl9KDZnrf/aiUJYUpVf89y8kyaxbRG7Y1SrX/jaumrv81vc61+kiMempujsM3Yw7w5qcw==",
-      "license": "ISC"
-    },
     "node_modules/glob": {
       "version": "10.4.5",
       "resolved": "https://registry.npmjs.org/glob/-/glob-10.4.5.tgz",