add edit thumbnail section to /user/edit-archive.html template.

templates/user/edit-archive.html

@@ -22,6 +22,14 @@
  });
 </script>
 
+<img alt="{{db-data.title}}" src="/storage/thumb/archive/{{db-data.slug}}">
+<form action="edit/archive-thumbnail" method="post" enctype="multipart/form-data">
+    <input required type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
+    <input required type="hidden" name="SLUG" value="{{db-data.slug}}">
+    <input required type="file" name="THUMBNAIL-FILE">
+    <input type="submit" value="Change Thumbnail">
+</form>
+
 <form action="/rename/archive-entry" method="post">
   <input required type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
    <input required type="hidden" name="ID" value="{{db-data.id}}">
@@ -31,8 +39,6 @@
     <input type="submit" value="Rename Entry">
 </form>
 
-<h3>TODO: Add thumbnail section</h3>
-
 <form action="/edit/archive" method="post">
   <input required type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
   <input required type="hidden" name="slug" value="{{db-data.slug}}">