add links to twitter and youtube

Signed-off-by: Michael Moese <frankenmichl@posteo.de>

templates/kontakt.html

@@ -16,6 +16,12 @@
      <p>
          <i class="fab fa-facebook"></i>&nbsp;<a href="https://www.facebook.com/Fdgl-Freunde-des-geordneten-Lärms-eV-331258777731606/">FdgL bei Facebook</a>
      </p>
+     <p>
+         <i class="fab fa-twitter"></i>&nbsp;<a href="https://twitter.com/fdglev">FdgL bei Twitter</a>
+     </p>
+     <p>
+         <i class="fab fa-youtube"></i>&nbsp;<a href="https://www.youtube.com/channel/UCqkK-zs5GwJ9Ghqlp_iKgvw">FdgL bei YouTube</a>
+     </p>
      <p>
          <i class="fab fa-mastodon"></i>&nbsp;<a href="https://metalhead.club/@FDGL">FdgL bei Mastodon</a>
      </p>