Add persistent Wifi Credentials?

 *The transitions were a bit too quick for folks to catch the wifi credentials so I added a couple different options for displaying them persistently.*

### Header

- Looks good floated to the right
- may need some `<i>` and `<b>` work

### Footer

- needed to include jQuery to append it to the progress bar
- also needed to use a negative top margin to get it to display.

**If you choose to keep this, one probably should be deleted.** I prefer the header myself...

#### Other tweaks

- cleaned up some tabs in `index.html`
- deleted first slide in preparation for the next meeting
- added reference and instructions for reveal.js in `README.md` so it can be tested locally before pull requests are made