docs - html tester

[rbalet]

I've added a tester to the app.

When pulling the code, we're now able to ng s to be able to test it out.

I'll be glad to create a stackblitz demo if I got the developer access to this repo :)

Note

I will also add some checkboxes to let us change variable on the go and to try the library out, but I'll do it in a separate issue