website: added link to kopia forum (kopia#561)

Author: jkowalski

site/config.toml

@@ -90,10 +90,10 @@ no = 'Sorry to hear that. Please <a href="https://github.com/kopia/kopia/issues/
 [params.links]
 # End user relevant links. These will show up on left side of footer and in the community page if you have one.
 [[params.links.user]]
-	name = "Slack"
-	url = "https://slack.kopia.io"
-	icon = "fab fa-slack"
-        desc = "Chat with fellow Kopia users"
+	name = "Kopia Forum"
+	url = "https://kopia.discourse.group"
+	icon = "fas fa-comments"
+    desc = "Chat with fellow Kopia users"
 [[params.links.developer]]
 	name = "Slack"
 	url = "https://slack.kopia.io"

site/content/_index.html

@@ -13,8 +13,12 @@
 	<a class="btn btn-lg btn-secondary mr-3 mb-4" href="https://github.com/kopia/kopia/releases">
 		Download <i class="fab fa-github ml-2"></i>
 	</a>
+	<br/>
+	<a class="btn btn-lg btn-warning mr-3 mb-4" href="https://kopia.discourse.group">
+		User Support Forum<i class="fas fa-comments ml-2"></i>
+	</a>
 	<a class="btn btn-lg btn-success mr-3 mb-4" href="https://slack.kopia.io">
-		Discuss on Slack <i class="fab fa-slack ml-2 "></i>
+		Developer Discusson <i class="fab fa-slack ml-2 "></i>
 	</a>
 	<p class="font-weight-bold h3 mt-5">Encrypted, Deduplicated, and Compressed Data Backups Using Your Own Cloud Storage</p>
 </div>