feat: integrate payload cms to landing page (#25)

* feat: integrate payload cms to landing page

* feat: add payload configuration and update TypeScript target

* fix: update TypeScript paths for payload configuration

* refactor: update config import paths to use local payload.config

* fix: update quotation marks for testimonials to use HTML entities

* fix: include withPayload in Next.js plugins for proper configuration

apps/landing/tsconfig.json

@@ -6,6 +6,7 @@
     "noEmit": true,
     "emitDeclarationOnly": false,
     "esModuleInterop": true,
+    "target": "ES2022",
     "module": "esnext",
     "moduleResolution": "bundler",
     "resolveJsonModule": true,