Migrate to Vue 3 and Vite

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/graphql/statistics.ts

@@ -1,7 +1,7 @@
 import gql from "graphql-tag";
 
 export const STATISTICS = gql`
-  query {
+  query Statistics {
     statistics {
       numberOfUsers
       numberOfEvents
@@ -15,3 +15,12 @@ export const STATISTICS = gql`
     }
   }
 `;
+
+export const CATEGORY_STATISTICS = gql`
+  query CategoryStatistics {
+    categoryStatistics {
+      key
+      number
+    }
+  }
+`;