remove inferno (bug TBD)

Inferno is out of date, and is a duplicate for the package build system we have. We actually have three build systems now:

- inferno
- Makefile (```make package```)
- gulp 

[gulp](https://github.com/mozilla/fireplace/pull/753) will win out. And fabric already bumps the newest version of the package on dev.

There is also some updates to the README that had some outdated stuff. Though I am going to write complete frontend docs on sphinx.
can you keep the glossary? not sure why it was originally trimmed and now you're removing it.

some sad times these are…