replace route instead of pushing

lib/pages/create_post.dart

@@ -169,7 +169,7 @@ class CreatePost extends HookWidget {
             name: titleController.text,
             communityId: selectedCommunity.value.id,
             auth: token.raw);
-        goTo(context, (_) => FullPostPage.fromPostView(res));
+        goToReplace(context, (_) => FullPostPage.fromPostView(res));
         return;
         // ignore: avoid_catches_without_on_clauses
       } catch (e) {

lib/util/goto.dart

@@ -14,6 +14,14 @@ Future<dynamic> goTo(
       builder: builder,
     ));
 
+Future<dynamic> goToReplace(
+  BuildContext context,
+  Widget Function(BuildContext context) builder,
+) =>
+    Navigator.of(context).pushReplacement(CupertinoPageRoute(
+      builder: builder,
+    ));
+
 void goToInstance(BuildContext context, String instanceUrl) =>
     goTo(context, (context) => InstancePage(instanceUrl: instanceUrl));