Page titles should be unique and descriptive

[briri]

The codebase current pulls the application name out of the branding.yml and uses it as the page title in application.rb. Each of these titles should be unique though across the site.

This seems like the accepted approach to handling this: https://rubyplus.com/articles/3321-Pretty-Page-Title-in-Rails-5

The page title should match the content of the <h1> of the page.

Also, update the home page <h1> so that it is more descriptive (e.g. 'Welcome to DMPRoadmap' instead of 'Welcome')

This feedback was provided from the UCOP electronic accessibility review. It was defined as having 'High' priority.