Added link to Matrix

Signed-off-by: Alexander Borsuk <me@alex.bio>

content/_index.md

@@ -113,7 +113,7 @@ licensed under the Apache License 2.0.
 
 - Report bugs or issues to [the issue tracker](https://github.com/organicmaps/organicmaps/issues) or [email us](mailto:hello@organicmaps.app)
 - [Discuss](https://github.com/organicmaps/organicmaps/discussions/categories/ideas) ideas or propose feature requests
-- Subscribe to our [Telegram Channel](https://t.me/OrganicMapsApp) for updates
+- Subscribe to our [Telegram Channel](https://t.me/OrganicMapsApp) or to the [[matrix] space](https://matrix.to/#/#organicmaps:matrix.org) for updates
 - Join our [Telegram Group](https://t.me/OrganicMaps) to discuss with other users
 - Присоединяйтесь к нашей [русскоязычной группе в Telegram](https://t.me/OrganicMapsRu) для обратной связи и помощи
 - Visit our [GitHub page](https://github.com/organicmaps/organicmaps)

content/_index.tr.md

@@ -108,7 +108,7 @@ Organic Maps, Apache License 2.0 altında lisanslanmış bir [açık kaynaklı y
 - [Sorun izleyicisine](https://github.com/organicmaps/organicmaps/issues) sorunları ve hataları bildirin.
 - Fikirleri [tartışın](https://github.com/organicmaps/organicmaps/discussions/categories/ideas) ya da özellik istekleri önerin
 - Güncellemeler için [Telegram Kanalımıza](https://t.me/OrganicMapsApp) abone olun
-- Diğer kullanıcılarla tartışmak için [Telegram Grubumuza](https://t.me/OrganicMaps) katılın
+- Diğer kullanıcılarla tartışmak için [Telegram Grubumuza](https://t.me/OrganicMaps) veya [[matrix] space](https://matrix.to/#/#organicmaps:matrix.org) katılın
 - Присоединяйтесь к нашей [русскоязычной группе в Telegram](https://t.me/OrganicMapsRu) для обратной связи и помощи
 - [GitHub sayfamızı](https://github.com/organicmaps/organicmaps) ziyaret edin
 - [E-posta](mailto:hello@organicmaps.app) ile bizimle iletişime geçin

content/support-us/index.md

@@ -26,6 +26,7 @@ descriptions into your language.
 - Fix red cities found by our [public transport validator](https://cdn.organicmaps.app/subway/), for subways and light rails to work in the app.
 - Support other users on [GitHub](https://github.com/organicmaps/organicmaps/issues),
 [Telegram](https://t.me/OrganicMaps) ([на русском](https://t.me/OrganicMapsRu)),
+[[matrix]](https://matrix.to/#/#organicmaps:matrix.org),
 [Twitter](https://twitter.com/OrganicMapsApp), [Facebook](https://facebook.com/OrganicMaps),
 [Instagram](https://instagram.com/OrganicMaps.app).
 - Tell everyone about Organic Maps. A bigger community is a stronger community.