Refactor content fetching and enhance UI mods

Refactored content fetching in the docs and blog pages to use a new 'getDocs' function to improve code reuse. Made minor adjustments to the UI in 'makerkit/page.tsx'. This involved modifying the layout and adding conditionals to tackle optional props. Also added a new textarea component reference in the UI package.

apps/web/app/(marketing)/blog/page.tsx

@@ -1,4 +1,4 @@
-import { unstable_cache as cache } from 'next/dist/server/web/spec-extension/unstable-cache';
+import { cache } from 'react';
 
 import { createCmsClient } from '@kit/cms';
 import { If } from '@kit/ui/if';