docs: update chat links to point to matrix (#2571)

.github/ISSUE_TEMPLATE/config.yml

@@ -5,6 +5,6 @@ contact_links:
     url: https://discourse.libretime.org/
     about: Please find existing questions and discussions here.
 
-  - name: LibreTime Chat
-    url: https://chat.libretime.org/
+  - name: LibreTime Chat (#libretime:matrix.org)
+    url: https://matrix.to/#/#libretime:matrix.org
     about: Discuss with the LibreTime community.

.github/workflows/housekeeping.yml

@@ -83,8 +83,8 @@ jobs:
             the next month.
 
             Please chat to us on the [forum](https://discourse.libretime.org/) or
-            ask for help on our [chat](https://chat.libretime.org/) if you have any
-            questions or need further support with getting this issue resolved.
+            ask for help on [#libretime:matrix.org](https://matrix.to/#/#libretime:matrix.org)
+            if you have any questions or need further support with getting this issue resolved.
 
             You may also label an issue as *pinned* if you would like to make sure
             that it does not get closed by this bot.
@@ -93,8 +93,8 @@ jobs:
             did not receive any further inputs.
 
             Feel free to let us know on the [forum](https://discourse.libretime.org/) or
-            ask for help on our [chat](https://chat.libretime.org/) if you feel this
-            issue should not have been closed.
+            ask for help on [#libretime:matrix.org](https://matrix.to/#/#libretime:matrix.org)
+            if you feel this issue should not have been closed.
 
             Thank you for your contributions.
           days-before-issue-stale: 150

README.md

@@ -26,7 +26,8 @@ we have a forum at [discourse.libretime.org](https://discourse.libretime.org).
 We are moving towards using the forum to provide community support and reserving
 the github issue queue for confirmed bugs and well-formed feature requests.
 
-You can also contact us through our [Mattermost instance](https://chat.libretime.org)
+You can also contact us through [Matrix
+(#libretime:matrix.org)](https://matrix.to/#/#libretime:matrix.org)
 where you can talk with other users and developers.
 
 ## Contributors

docs/releases/_release-head.md

@@ -6,7 +6,7 @@ import TarballLink from '@site/src/components/TarballLink';
 
 Please report new issues and/or feature requests in [the issue tracker](https://github.com/libretime/libretime/issues).
 
-For general discussion or if you need help, you can join the [discourse](https://discourse.libretime.org/) forum or chat on the [mattermost](https://chat.libretime.org/) server.
+For general discussion or if you need help, you can join the [discourse](https://discourse.libretime.org/) forum or chat on [#libretime:matrix.org](https://matrix.to/#/#libretime:matrix.org).
 
 :::