Update Typography resources:

[1] Basic typography update, in progress (check links PR #96 and <pending link here>), that includes definition of headings sizes, as well as provides basic HTML structure for page views (based on Web Accessibility standards);

Markup format currently proposed:

h1 {font-size: 1.75rem;} => 28px
h2 {font-size: 1.5rem;} => 24px
h3 {font-size: 1.375rem;} => 22px
h4 {font-size: 1.205rem;} => 20px
h5 {font-size: 1.125rem;} => 18px
h6 {font-size: 1.0625rem;} => 17px

Notice: markup format offered just as a reference.