Implement a nav toolbar above timeline

[jlegrone]

Basic requirements:

• About L4GG link (http://lawyersforgoodgovernment.org)
• Donate link (https://actionnetwork.org/fundraising/support-lawyers-for-good-government-in-the-fight-to-protect-our-democracy)

Future Requirements:

• Filter by tag controls -- Filter timeline events by tag #5
• Filter by date controls -- Filter timeline events by start/end date #26
• Zoom controls -- Add customized / improved zoom controls #28 (not sure yet if this will go in the toolbar)

[sgeofrank]

Main brand background color is white.
Secondary background color is 323a65 (button backgrounds, menu backgrounds etc)
Primary accent color: 40b2e2

font file for headers: https://static-assets.strikinglycdn.com/fonts/themes/fresh/gothamrnd-book.woff generic sans-serif for normal text