typescript definitions + remove unnecessary warning

[PabloSzx]

I wanted to implement use-ackee in a Next.js project programmatically as mentioned in #15 but I realized there are no TypeScript definitions neither in ackee-tracker or use-ackee, and to do things right I need the definitions in here before making them for use-ackee.

I also had to remove the warning Ackee is not executing automatically... on server side because in any server side rendering project it would print it in every page (in console) for nothing.

[electerious]

Thanks for adding TS definitions, but I'm not a TS user and therefore don't want to maintain type definitions for my projects.