Add better doucmentation on using SVELT/SAPPER

[nherriot]

The SVELT/SAPPER documentation is great to get up and running but we need:

1. documentation on the general design of the application and how it works.
2. there is nothing explaining how to deploy this. We NEED that!
3. we also need to document the ansible scripts.
4. the ansible scripts need to be updated to include the nginx setup.
5. the ansible scripts need to be updated to include the lets encrypt setup.
6. the documentation needs to explain how to get SSL/HTTPS setup and why it's important.