Big batch of UI updates (#276)

* Replace react-native-root-toast with a custom toast that fits the visual style

* Tune dark mode colors

* Tune colors a bit more

* Move the reply prompt to a fixed position in the footer

* Fully hide muted posts but give a control to show anyway (close #270)

* Improve thread rendering (better clarity on reply lines)

* Add follower/following counts to side menu

* Fix issues with display name overflows

package.json

@@ -70,7 +70,6 @@
     "react-native-progress": "^5.0.0",
     "react-native-reanimated": "^2.9.1",
     "react-native-root-siblings": "^4.1.1",
-    "react-native-root-toast": "^3.4.0",
     "react-native-safe-area-context": "^4.4.1",
     "react-native-screens": "^3.13.1",
     "react-native-splash-screen": "^3.3.0",