site-key form made resulable

templates/panel/add-site-key/existing-level.html

@@ -0,0 +1,12 @@
+<div class="sitekey-form__add-level-flex-container">
+  <!-- insert Javascript for adding more levels as needed -->
+  <label class="sitekey-form__label" for="level1">Level <.= level .></label>
+</div>
+
+<input
+  class="sitekey-form__input"
+  type="number"
+  name="level1"
+  id="level<.= level .>"
+  value=""
+/>