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/typings/absinthe.d.ts

@@ -0,0 +1,5 @@
+declare module "@framasoft/socket";
+
+declare module "@framasoft/socket-apollo-link";
+
+declare module "apollo-absinthe-upload-link";