UI - Configure branding on Home Page and Header

[nateiam]

As a Herd Administrator I want to configure branding so the product is known to all users by awesome branding terms.

Acceptance Criteria

• Upper left hand of header has configurable logo image
• Home page center banner title and tagline text are both configurable
• Values (text and logo name) above come from UI config file
• Tech Note - use Webpack for this instead of Gulp+Webpack. Make sure all the buildInfos don't break from lack of Gulp.