replace SVG w/new logo
replace SVG w/new logo

also cleaned up some of the markup to minify it a bit. this should make
it easier to maintain in the future. note: a lot of the stuff that
design programs generate for SVG files aren't needed (mainly there to
be safe in older browsers)

prathamesh-sonpatki/frontend,circleci/frontend,circleci/frontend,RayRutjes/frontend,prathamesh-sonpatki/frontend,RayRutjes/frontend,circleci/frontend