Added HTML and CSS styles

I added some styles.  Many can likely be written more efficiently:)
I'm not trying to merge this onto master.  I meant to request a merge to dev.webcompat.com, but I suppose you can always overwrite this stuff.

Questions:
-Is the CSS Reset redundant?  

-Is the meta-data set somewhere other than the html?

-You might want to check my relative urls...

-Lightswitch is an svg - do I need a fallback?  I included a png in the img folder
http://css-tricks.com/using-svg/
http://dbushell.com/2013/02/04/a-primer-to-front-end-svg-hacking/

-I copied this style {{ url_for("join") }}
but I did not write the functional links