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/types/apollo.ts

@@ -0,0 +1,9 @@
+import { GraphQLError } from "graphql/error/GraphQLError";
+
+export class AbsintheGraphQLError extends GraphQLError {
+  readonly field: string | undefined;
+}
+
+export type TypeNamed<T extends Record<string, any>> = T & {
+  __typename: string;
+};