WIP: New User Guide (#3984)

* initial commit

* Theme setup on twenty-website package

* Left bar, Content done

* Content added, useDeviceType hook added

* useDeviceType file renamed

* Responsiveness introduced

* Mobile responsiveness fix

* TOC layout

* PR fixes

* PR changes 2

* PR changes #3

packages/twenty-website/src/app/user-guide/[slug]/page.tsx

@@ -0,0 +1,16 @@
+import UserGuideContent from '@/app/components/user-guide/UserGuideContent';
+import { getPost } from '@/app/get-posts';
+
+export default async function UserGuideSlug({
+  params,
+}: {
+  params: { slug: string };
+}) {
+  const basePath = '/src/content/user-guide';
+
+  const mainPost = await getPost(
+    params.slug && params.slug.length ? params.slug : 'home',
+    basePath,
+  );
+  return mainPost && <UserGuideContent item={mainPost} />;
+}