Remove redundant home return buttons

frontend/src/App.tsx

@@ -679,16 +679,12 @@ function LessonPage(props: {
   );
 }
 
-function PostPage(props: { post: PostCard; onGoHome: () => void }) {
-  const { post, onGoHome } = props;
+function PostPage(props: { post: PostCard }) {
+  const { post } = props;
   const postBody = stripLeadingTitleHeading(post.body, post.title);
 
   return (
     <section className="thread-view">
-      <button type="button" className="back-link" onClick={onGoHome}>
-        Back to home
-      </button>
-
       <article className="panel">
         <header className="thread-header">
           <h1>{post.title}</h1>
@@ -865,8 +861,8 @@ function HomeView(props: {
   );
 }
 
-function SignInPage(props: { auth: AuthState; onGoHome: () => void }) {
-  const { auth, onGoHome } = props;
+function SignInPage(props: { auth: AuthState }) {
+  const { auth } = props;
   const query = new URLSearchParams(window.location.search);
   const error = query.get("error");
   const returnTo = query.get("return_to") || "/";
@@ -877,10 +873,6 @@ function SignInPage(props: { auth: AuthState; onGoHome: () => void }) {
 
   return (
     <section className="signin-page">
-      <button type="button" className="back-link" onClick={onGoHome}>
-        Back
-      </button>
-
       <article className="panel signin-panel">
         <header className="thread-header">
           <h1>Sign in</h1>
@@ -1091,14 +1083,11 @@ function PostRouteView(
     return (
       <section className="page-message">
         <h1>Post not found.</h1>
-        <button type="button" className="back-link" onClick={props.onGoHome}>
-          Back to home
-        </button>
       </section>
     );
   }
 
-  return <PostPage post={selectedPost} onGoHome={props.onGoHome} />;
+  return <PostPage post={selectedPost} />;
 }
 
 function LessonRouteView(
@@ -1198,7 +1187,7 @@ function DiscussionRouteView(props: AppContentProps & { discussionId: number })
 
 function AppContent(props: AppContentProps) {
   if (isSignInRoute(props.pathname)) {
-    return <SignInPage auth={props.data.auth} onGoHome={props.onGoHome} />;
+    return <SignInPage auth={props.data.auth} />;
   }
 
   if (isActivityRoute(props.pathname)) {