Add a warning to logged out users that tours will break.

source/content-scripts/scss/main.scss

@@ -20,3 +20,9 @@
     width: 1rem;
   }
 }
+
+.tish-warning {
+  border: 1px solid var(--alert-color);
+  color: var(--alert-color);
+  padding: 8px;
+}

source/tours/interface/homepage.tsx

@@ -6,8 +6,30 @@ import {
   renderInContainer,
 } from "../utilities.js";
 
+const userIsLoggedIn =
+  document.querySelector(".logged-in-user-username") !== null;
+
 const step01 = renderInContainer(
   <>
+    {userIsLoggedIn ? (
+      ""
+    ) : (
+      <p class="tish-warning">
+        It looks like you aren't logged in to Tildes. Tildes Shepherd assumes
+        that you are logged in as a lot of the Tildes interface isn't shown to
+        logged out users.
+        <br />
+        To still let anyone without an account benefit from the extension you
+        may continue, however, know that certain parts of the tour <b>
+          will
+        </b>{" "}
+        break and look weird.
+        <br />
+        It's highly recommended that you exit the tour, log in and start it
+        again.
+      </p>
+    )}
+
     <h1>The Homepage</h1>
 
     <p>