Navbar + JS smooth transition #71

The navbar should be fixed at some point. It has three primary issues I can find.

• It's unreadable on much of the site due to the web font. Either make a solid background for the navbar, or use javascript to vary the font color to a complementary readable color as we scroll
• At screen widths of less than ~700px, the MLH trust badge covers things on the navbar
• The "smooth" transitions don't work correctly if you're not at the top of the page. The javascript calculates the offset from the top of the page, and transitions based on that. This is wrong. It should get where you are currently on the page, the location of the desired target, and transition in this way.