migrate to Eleventy v3 and ESM, upgrade dependencies

package.json

@@ -3,6 +3,7 @@
   "version": "2.0.0",
   "description": "This is the WIP rewrite of the ESE website.",
   "main": "index.js",
+  "type": "module",
   "scripts": {
     "prebuild": "npx @11ty/eleventy --formats=logo.svg",
     "build": "npx @11ty/eleventy --formats=md,njk",
@@ -12,10 +13,9 @@
   "author": "FSR Informatik TU Dresden",
   "license": "MIT",
   "devDependencies": {
-    "@11ty/eleventy": "^2.0.1",
-    "@11ty/eleventy-img": "^4.0.2",
+    "@11ty/eleventy": "^3.0.0",
+    "@11ty/eleventy-img": "^5.0.0",
     "@11ty/eleventy-navigation": "^0.3.5",
-    "@11ty/eleventy-plugin-bundle": "^1.0.5",
     "@fortawesome/fontawesome-free": "^6.6.0",
     "eleventy-plugin-gen-favicons": "^1.1.3",
     "eleventy-plugin-icons": "^4.5.1",