Fix testimonials background, faq clickability and some case-studies page edits. (#19657)

As title. Also copied release-notes related files from `twenty-website`
to `twenty-website-new`.

packages/twenty-website-new/package.json

@@ -5,7 +5,8 @@
     "nx": "NX_DEFAULT_PROJECT=twenty-website-new node ../../node_modules/nx/bin/nx.js",
     "dev": "npx next dev",
     "build": "npx next build",
-    "start": "npx next start"
+    "start": "npx next start",
+    "convert-images": "node ./scripts/convert-png-to-webp.mjs"
   },
   "dependencies": {
     "@base-ui/react": "^1.3.0",
@@ -35,6 +36,7 @@
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "@types/three": "^0.183.1",
-    "babel-plugin-react-compiler": "1.0.0"
+    "babel-plugin-react-compiler": "1.0.0",
+    "sharp": "^0.33.5"
   }
 }