Merge pull request #717 from skoolbus39/wdn-images

Add margin-bottom to classes .frame, .wdn-frame
Increased line-height for .wdn-alt-header
Merge pull request #718 from skoolbus39/wdn-headers

Increased line-height for .wdn-alt-header
Anchor bottom-border and :visited state updates
Removed opacity from red navigation bar
Merge pull request #720 from skoolbus39/wdn-nav-opacity

Removed opacity from red navigation bar
Added a spectrum of neutral colors to be used for consistent UI. Note: the base text and heading text colors have also been modified to use these new colors.
Footer layout updates
Addresses @kabel’s color concerns
Add a label to the source code textarea for accessibility
Update button background color to the same as the blue wdn_notice box
Add selected attribute to indicate which option should be the default
Merge pull request #721 from saltybeagle/examples_pa11y

Accessibility (pa11y) fixes for the examples pages
Fix double-negative right margin for directly nested grid-sets
I didn’t find the `:visited` state color transition to be too weird, but I don’t have particularly strong feelings for keeping it different from the `:hover` state either. It’s not uncommon for the two to be the same color.
I didn’t find the `:visited` state color transition to be too weird, but I don’t have particularly strong feelings for keeping it different from the `:hover` state either. It’s not uncommon for the two to be the same color.
Added .kern class to text.less; to be applied in <h> tags, site header and navigation
Merge pull request #722 from skoolbus39/wdn-text

Kerning, ligatures, and letter-spacing
Merge pull request #719 from skoolbus39/wdn-anchors

Anchor bottom-border and :visited state updates
Bumped dependency version number to 4.0.11