Replaced Reddit with Forum link (#1831)

Signed-off-by: Daniel Gray <dng@disroot.org>

docs/index.en.md

@@ -39,7 +39,7 @@ It's important for a website like Privacy Guides to always stay up-to-date. We n
 
 <div class="grid cards" style="margin:auto;max-width:800px;text-align:center;" markdown>
 
-- [:simple-reddit: Join the r/PrivacyGuides Subreddit](https://www.reddit.com/r/privacyguides)
+- [:simple-discourse: Join our forum](https://discuss.privacyguides.org/)
 - [:simple-mastodon: Follow us on Mastodon](https://mastodon.social/@privacyguides){ rel=me }
 - [:material-book-edit: Contribute to this website](https://github.com/privacyguides/privacyguides.org)
 - [:simple-matrix: Chat with us on Matrix](https://matrix.to/#/#privacyguides:matrix.org)

mkdocs.yml

@@ -15,9 +15,9 @@ extra:
     - icon: simple/matrix
       link: https://matrix.to/#/#privacyguides:matrix.org
       name: Matrix
-    - icon: simple/reddit
-      link: https://reddit.com/r/PrivacyGuides
-      name: Reddit
+    - icon: simple/discourse
+      link: https://discuss.privacyguides.org/
+      name: Forum
     - icon: simple/mastodon
       link: https://mastodon.social/@privacyguides
       name: Mastodon