Refactor: Remove unused code and update variable names

- Remove unused `RevoltTweenColour` animation spec.
- Remove KDoc for `isServerAlreadyJoined` function.
- Change exception variable names to `_` to indicate they are unused.

app/src/main/java/chat/revolt/activities/MainActivity.kt

@@ -166,7 +166,7 @@ class MainActivityViewModel @Inject constructor(
         try {
             val res = RevoltHttp.get("/".api())
             return res.status.value == 200
-        } catch (e: Exception) {
+        } catch (_: Exception) {
             return false
         }
     }
@@ -225,7 +225,7 @@ class MainActivityViewModel @Inject constructor(
             val canReachRevolt = canReachRevolt()
             val valid = try {
                 RevoltAPI.checkSessionToken(token)
-            } catch (e: Throwable) {
+            } catch (_: Throwable) {
                 false
             }
 
@@ -430,7 +430,6 @@ class MainActivity : AppCompatActivity() {
 val RevoltTweenInt: FiniteAnimationSpec<IntOffset> = tween(400, easing = EaseInOutExpo)
 val RevoltTweenFloat: FiniteAnimationSpec<Float> = tween(400, easing = EaseInOutExpo)
 val RevoltTweenDp: FiniteAnimationSpec<Dp> = tween(400, easing = EaseInOutExpo)
-val RevoltTweenColour: FiniteAnimationSpec<Color> = tween(400, easing = EaseInOutExpo)
 
 val NavTweenInt: FiniteAnimationSpec<IntOffset> = tween(350, easing = EaseInOutExpo)
 val NavTweenFloat: FiniteAnimationSpec<Float> = tween(350, easing = EaseInOutExpo)

app/src/main/java/chat/revolt/composables/screens/chat/discover/DiscoverServersList.kt

@@ -138,11 +138,6 @@ fun DiscoverServersList(
     }
 }
 
-/**
- * Check if the server with the given invite code is already joined
- * @param inviteCode The invite code of the server
- * @return True if the server is already joined, false otherwise
- */
 @Composable
 private fun isServerAlreadyJoined(serverId: String): Boolean {
     // Check if the server exists in RevoltAPI.serverCache