Added small logo to header

Fixes Issue #8 

I removed the svg from the main, and called that using an img tag. In order to do that, I changed the svg file to already be white.

Then I added svg to the header inline so that I on hover I can change the color to match the text. If we don't want that, then I can get rid of the inline svg, and switch to an img tag which would clean up the mark up.