[WIP] Best Practices / QoL Updates

[mrtrimble]

Issue:

190

Updates:

• Updated links
  • All external links now have rel="external noopener"
  • Fixed all broken links
  • Ensured demo links are not affected by site styles
• Homepage
  • Moved hero section inside <main>
  • Set alt="" text on images
  • Moved <figure> text into <figcaption>
• Meta Information
  • Added social sharing image
  • Added canonical URL
  • Added theme-color
  • Added descriptions to each page
• Documentation
  • Removed hidden code textareas from tabindex
  • Added unique text to Demo and Markup headers
• Accessibility
  • Removed redundant <nav> in ToC
  • Add role="presentation" to all skeletons
• Other Fixes
  • Added new rounded utilities to tips

Screenshots:

Social Sharing Example (Twitter)