remove old template

.github/ISSUE_TEMPLATE/FRONTEND-MIGRATION.yml

@@ -1,23 +0,0 @@
-name: Frontend Migration
-description: Tracking our new React based frontend
-title: "[Frontend Migration]: "
-labels: ["react migration"]
-
-body:
-  - type: dropdown
-    id: domain
-    attributes:
-      label: Domain
-      options:
-        - Frontend
-        - Backend
-        - Combined
-    validations:
-      required: true
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-      placeholder: Organizing our React frontend migration
-    validations:
-      required: true