fixup! Fix URL generation when not at domain root

Oops -- missed these two!  Sorry for the noise; let me know if you'd
like me to squash and resubmit.

app/main.py

@@ -733,7 +733,7 @@ async def outbox_by_public_id(
 
     if maybe_object.ap_type == "Article":
         return RedirectResponse(
-            f"/articles/{public_id[:7]}/{maybe_object.slug}",
+            f"{BASE_URL}/articles/{public_id[:7]}/{maybe_object.slug}",
             status_code=301,
         )
 

app/templates/login.html

@@ -7,7 +7,7 @@
         {% if error %}
             <p class="primary-color">Invalid password.</p>
         {% endif %}
-        <form class="form" action="/admin/login" method="POST">
+        <form class="form" method="POST">
             <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
             <input type="hidden" name="redirect" value="{{ redirect }}">
             <input type="password" placeholder="password" name="password" autofocus>