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/src/data/hero-stats.json

@@ -0,0 +1,5 @@
+[
+  { "value": "180K+", "label": "Member" },
+  { "value": "500+", "label": "Tutorial" },
+  { "value": "24/7", "label": "Yapping" }
+]