chore: remove cms and fix some styles (#29)

* chore: remove all references to PayloadCMS

* fix: nextjs landing utils

* feat: refactor community, features, hero, learning resources, and testimonials components to use external JSON data

* fix:remove hero logo box

* fix: remove unused image in public

* fix: change logo.png to logo.webp

* fix: update button styles for improved visibility

* chore: restructure component organization

* fix: update import path for global styles in layout component

* fix: adjust alignment of hero stats section for better layout

* fix: update testimonials placeholder sample data

* fix: update header component to use router for navigation and add signin page

apps/landing/.env.example

@@ -1,6 +1 @@
-CMS_SECRET=your-very-long-secret-key
-CMS_POSTGRES_URL=postgres://user:password@host:port/database
-CMS_STORAGE_ENDPOINT=https://your-s3-endpoint.com
-CMS_STORAGE_ACCESS_KEY_ID=your-access-key-id
-CMS_STORAGE_SECRET_ACCESS_KEY=your-secret-access-key
-CMS_STORAGE_REGION=ap-southeast-1
+NEXT_PUBLIC_API_URL=