move tmdb API key to backend

[kapcom01]

It is not secure to have our key in public. In the future we must move the key to backend, running in a private server.

[kapcom01]

I think we should make a web server to run on the backend using nodejs: https://nodejs.org/en/docs/guides/getting-started-guide

[kapcom01]

This web server should provide a public API that we can call from rip.js like http://rip_server/get_actor_info instead of using the function anazitisi. The function anazitisi and all its dependencies should be moved to the backend web server because it contains the tmdb key which is private information.