Small fixes on fragment/activity transitions

- Finish LoginActivity after login to prevent vavigate back to it
- Add transition animations between fragments

app/src/main/java/fr/chenry/android/freshrss/activities/LoginActivity.kt

@@ -65,6 +65,7 @@ class LoginActivity: AppCompatActivity() {
     private fun startNextActivity() {
         startActivity(Intent(this, MainActivity::class.java))
         //startActivity(Intent(this, TestActivity::class.java))
+        finish()
     }
 
     private fun attemptLogin() {

app/src/main/res/navigation/nav_graph.xml

@@ -26,7 +26,10 @@
         <action
             android:id="@+id/action_subscriptionArticlesFragment_to_subscriptionArticlesDetailFragment"
             app:destination="@+id/subscriptionArticlesDetailFragment"
-        />
+            app:enterAnim="@anim/nav_default_pop_enter_anim"
+            app:exitAnim="@anim/nav_default_pop_exit_anim"
+            app:popEnterAnim="@anim/nav_default_pop_enter_anim"
+            app:popExitAnim="@anim/nav_default_pop_exit_anim" />
     </fragment>
     <fragment
         android:id="@+id/subscriptionArticlesDetailFragment"
@@ -40,5 +43,9 @@
     </fragment>
     <action
         android:id="@+id/action_global_subscriptionArticlesFragment"
-        app:destination="@id/subscriptionArticlesFragment" />
+        app:destination="@id/subscriptionArticlesFragment"
+        app:enterAnim="@anim/nav_default_pop_enter_anim"
+        app:exitAnim="@anim/nav_default_pop_exit_anim"
+        app:popEnterAnim="@anim/nav_default_pop_enter_anim"
+        app:popExitAnim="@anim/nav_default_pop_exit_anim" />
 </navigation>
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