docs: add cloud plans & pricing page (#13420)

* docs: add cloud plans & pricing page

* fix buttons

* simplify condition

* remove test frontmatter

* design fixes and changes

* styling fixes

* change node version for tests

* fix build error

* fix tests

* fix github pipeline

www/apps/cloud/sidebar.mjs

@@ -118,6 +118,11 @@ export const sidebar = [
             title: "Overview",
             path: "/billing",
           },
+          {
+            type: "link",
+            title: "Plans & Pricing",
+            path: "/pricing",
+          },
           {
             type: "link",
             title: "Manage Billing Details",