Added SEO to website pages (#5106)

Added SEO to Contributors, Contributor, User Guide (+ each of it's
pages), Changelog, OSS friends: titles, descriptions

Co-authored-by: Ady Beraud <a.beraud96@gmail.com>

packages/twenty-website/src/shared-utils/fetchArticleFromSlug.ts

@@ -0,0 +1,6 @@
+import { getPost } from '@/app/_server-utils/get-posts';
+
+export async function fetchArticleFromSlug(slug: string, basePath: string) {
+  const effectiveSlug = slug && slug.length > 0 ? slug : 'home';
+  return await getPost(effectiveSlug, basePath);
+}