docs: remove old documentation and add a new one

[ghost]

In the "Docs" section, the link points to the original github.io page which is no longer working. Create a faker-js.github.io repository and host the docs there (just a suggestion)

[bolshoytoster]

@xryshirfxn It looks like documentation is still hosted on netlify. We could point to that instead.

[Shinigami92]

In 1-2 days we will have hopefully deployed #80
For everything else, please subscribe to #87

[ghost]

Great to know. Thanks

[JessicaSachs]

Yeah so we need to kill the old docs and we need to migrate the examples.