Review README and install docs

[willingc]

Now that @minrk's #28 has been merged, the README and install docs should be reviewed for accuracy.

[willingc]

I tried to set up on a Digital Ocean instance Ubuntu 16.04 last night and ran into some instructions that could be improved:

• setting hosts
• let's encrypt process on 16.04 Ubuntu and certbot

Note:
Ubuntu Xenial has an old version of Certbot packaged for it that lacks a few features.
The webroot plugin doesn't have an interactive mode, so you'll need to specify your
domains and webroot paths on the command line to use this plugin.

[minrk]

The webroot interactive mode shouldn't be an issue, since we can't use interactive mode on ansible.

How would you improve the host-setting?

[willingc]

Hey Min, Thanks for pointing out the webroot interactive mode as I realized later that the ansible scripts were handling the let's encrypt cert creation.

As for the host setting, it wasn't clear to me from the documentation (lol) that I was simply taking hosts.example, entering my host info, and saving as hosts.

Overall, I'm not satisfied that the docs are user focused enough (lots of bouncing between the README, docs, and source code). I'm going to try to improve that. The Digital Ocean droplet on Ubuntu 16.04 is my first user test on this.

[minrk]

Sounds great, looking forward to it.