Separate admin API endpoint with sub path /admin

Author: dannyh79

features/attendee_import.feature

@@ -1,6 +1,6 @@
 Feature: Attendee Importation
-  Scenario: POST /attendees
-    When I make a POST request to "/attendees" with file:
+  Scenario: POST /admin/attendees with a CSV file that contains attendee information
+    When I make a POST request to "/admin/attendees" with file:
     """
     token,display_name,
     "fccfc8bfa07643a1ca8015cbe74f5f17","Aotoki",

worker/controller/attendee.ts

@@ -4,7 +4,7 @@ import { IRequest, status } from 'itty-router'
 
 export type AttendeeRequest = IRequest
 
-@Post('/attendees')
+@Post('/admin/attendees')
 export class CreateAttendees extends OpenAPIRoute {
   static schema: OpenAPIRouteSchema = {
     summary: 'Creates attendees',