Moving queries into dedicated files (#1210)

* Moving queries into dedicated files

* fix ci

front/src/modules/activities/graphql/mutations/deleteActivity.ts

@@ -0,0 +1,9 @@
+import { gql } from '@apollo/client';
+
+export const DELETE_ACTIVITY = gql`
+  mutation DeleteActivity($activityId: String!) {
+    deleteManyActivities(where: { id: { equals: $activityId } }) {
+      count
+    }
+  }
+`;