Updated to fix global css error, source logo from bitbucket instead of locally

After running the character sheet for the first time on roll20, I had a CSS security error which I am guessing came from leaving some styling on the html tag. So I moved the styling to the character sheet div and made sure everything else was under that div as well for good measure.

I also moved the src for the image shown from a file included in the repo to its location in bitbucket. 

Hopefully this should fix those issues and testing this sheet can continue!

Thanks!