Modified URLs and added button to share on LinkedIn (#5306)

- Removed the env variable and added the current URL in contributor's
page
- Added button to share on LinkedIn on contributor's profile
- Fixed absolute image URL for release API

---------

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

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

@@ -58,10 +58,7 @@ export default async function ({ params }: { params: { slug: string } }) {
               rank={rank}
               activeDays={activeDays}
             />
-            <ProfileSharing
-              userUrl={contributor.url}
-              username={contributor.id}
-            />
+            <ProfileSharing username={contributor.id} />
             <ActivityLog data={pullRequestActivityArray} />
             <PullRequests
               list={