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/fragmentTypes.json

@@ -0,0 +1,11 @@
+{
+  "__schema": {
+    "types": [
+      {
+        "possibleTypes": [{ "name": "Event" }, { "name": "Actor" }],
+        "name": "SearchResult",
+        "kind": "UNION"
+      }
+    ]
+  }
+}