Remove external dependencies e.g. Google fonts, maxcdn etc.

[mariobehling]

The API web service uses external dependencies. In order to avoid sharing our data with external services we need to avoid and remove external services as much as possible.

Compare https://api.eventyay.com

[mariobehling]

I think Google fonts would be the easiest thing to remove first.

[chiraag-kakar]

I am working on this issue @mariobehling