media-u project listing and image;
added links to all the images;
converted all images to jpg -> reducing load by ~1.3MB
fix media-u link;
remove floaty stuff; use position sticky to fix sidebar shift on-x-scrolling on small screnns;
restore the html5.png logo, since jpg with no alpha is bigger and gif looks ugly;
minimalize the text in the sidebar;
new image for media-u;