Properly add prickle and smolder labels (fixes #2636)

.appends/.github/labels.yml

@@ -174,3 +174,11 @@
 - name: "❔question❔"
   description: "I have a proposal or question about things, but nothing is broken."
   color: "293028"
+
+- name: "prickle💢"
+  description: "This issue should be skipped by the auto-responder."
+  color: "FFFFFF"
+
+- name: "smolder🍲"
+  description: "Lower-priority and/or future idea"
+  color: "8B0000"