feat: news and notifications page (#1660)

* Add news and notifications

* Add localization for news and notifications

* Remove news caching

* Add fetching news befor openning news page

* Fix not updating news page

* Delete debug output

* Remove news and notificztions with only self-hosted servers

* Add stack filters to fetching news request

* Add fetching news with changing stack in the client

* small refactoring

* polishing

* Rename newsModel files and fix naming in code

* fix: remove custom signals; fetch news only on stack expansion

* chore: delete unnecessary code

* chore: code style fixes

* fix: fixed memory leak in gateway controller

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Co-authored-by: vkamn <vk@amnezia.org>

client/images/controls/unread-dot.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 35 35" fill="none" xmlns="http://www.w3.org/2000/svg">
+<circle cx="17.5" cy="17.5" r="15" fill="#FBB36B" stroke="#1C1D21" stroke-width="5"/>
+</svg>