Added usage and specs nav tabs to the site

[raquelarrojo]

Checklist (Check off all the items before submitting)

• [x] Build process is done without errors and all tests pass in /lib directory.
• [x] Self-reviewed the code prior to submitting.
• [x] Meets accessibility standards.
• [x] Added/updated documentation to /website as needed.
• [x] Added/updated tests as needed.

Purpose

Add nav tabs' usage and specifications pages to the site.

Description

• Nav tabs' usage and specifications pages added to the site.
• Changed the title to include a blank space in the title when the component's name is composed by two words, to keep it the same in all components.
• Changed typography tokens as a subsection of design tokens section.

Closes #1474