Bundle brainstorm server dependencies instead of requiring npm install

Vendor node_modules into the repo so the brainstorm server works
immediately on fresh plugin installs without needing npm at runtime.

skills/brainstorming/scripts/node_modules/gopd/index.d.ts

@@ -0,0 +1,5 @@
+declare function gOPD<O extends object, K extends keyof O>(obj: O, prop: K): PropertyDescriptor | undefined;
+
+declare const fn: typeof gOPD | undefined | null;
+
+export = fn;