Confirmation page and minor improvements to homepage and form messages

Basic redirect with flash messages for success and error messages

src/routes/subscriptions.rs

@@ -72,7 +72,7 @@ impl IntoResponse for SubscribeError {
                 }),
             )
                 .into_response(),
-            SubscribeError::ValidationError(_) => Redirect::to("/register").into_response(),
+            SubscribeError::ValidationError(_) => Redirect::to("/").into_response(),
         }
     }
 }
@@ -125,7 +125,7 @@ pub async fn subscribe(
         .await
         .context("Failed to commit the database transaction to store a new subscriber.")?;
     messages.success("A confirmation email has been sent.");
-    Ok(Redirect::to("/register").into_response())
+    Ok(Redirect::to("/").into_response())
 }
 
 #[tracing::instrument(