build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

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

src/graphql/statistics.ts

@@ -0,0 +1,26 @@
+import gql from "graphql-tag";
+
+export const STATISTICS = gql`
+  query Statistics {
+    statistics {
+      numberOfUsers
+      numberOfEvents
+      numberOfLocalEvents
+      numberOfComments
+      numberOfLocalComments
+      numberOfGroups
+      numberOfLocalGroups
+      numberOfInstanceFollowings
+      numberOfInstanceFollowers
+    }
+  }
+`;
+
+export const CATEGORY_STATISTICS = gql`
+  query CategoryStatistics {
+    categoryStatistics {
+      key
+      number
+    }
+  }
+`;