fix: open Follow us footer links in a new tab

Social media links in the "Follow us" footer section now open in a new
tab instead of navigating away from the docs page.

Added target="_blank" rel="noopener noreferrer" to all eight links
(Blog, Facebook, X, Instagram, LinkedIn, YouTube, Mastodon, Feed).

Fixes #12322

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

Author: skjnldsv

build/index-template.html

@@ -283,14 +283,14 @@ <h1>Interact</h1>
 			<div class="col-sm-2">
 				<h1>Follow us</h1>
 				<ul>
-					<li><a href="https://nextcloud.com/blog/">Blog</a></li>
-					<li><a href="https://www.facebook.com/Nextclouders/">Facebook</a></li>
-					<li><a href="https://x.com/nextclouders">X</a></li>
-					<li><a href="https://instagram.com/nextclouders">Instagram</a></li>
-					<li><a href="https://www.linkedin.com/company/10827569/">LinkedIn</a></li>
-					<li><a href="https://youtube.com/nextcloud">YouTube</a></li>
-					<li><a href="https://mastodon.xyz/@nextcloud">Mastodon</a></li>
-					<li><a href="https://nextcloud.com/feed/">Feed</a></li>
+					<li><a href="https://nextcloud.com/blog/" target="_blank" rel="noopener noreferrer">Blog</a></li>
+					<li><a href="https://www.facebook.com/Nextclouders/" target="_blank" rel="noopener noreferrer">Facebook</a></li>
+					<li><a href="https://x.com/nextclouders" target="_blank" rel="noopener noreferrer">X</a></li>
+					<li><a href="https://instagram.com/nextclouders" target="_blank" rel="noopener noreferrer">Instagram</a></li>
+					<li><a href="https://www.linkedin.com/company/10827569/" target="_blank" rel="noopener noreferrer">LinkedIn</a></li>
+					<li><a href="https://youtube.com/nextcloud" target="_blank" rel="noopener noreferrer">YouTube</a></li>
+					<li><a href="https://mastodon.xyz/@nextcloud" target="_blank" rel="noopener noreferrer">Mastodon</a></li>
+					<li><a href="https://nextcloud.com/feed/" target="_blank" rel="noopener noreferrer">Feed</a></li>
 				</ul>
 			</div>
 		</div>