* Update assets and styles to new versions
* Update 404 pattern and template
* Remove big header pattern
* Update templates to new versions
* Fix custom-futura colors
First Seedlet was changed so that all custom CSS variables for color
definitions are associated with the 'seedlet-custom-color-overrides'
stylesheed. (Previously only editor override styles were associated
with that stylesheet.
Next Spearhead was changed to first dequeue that stylesheet, THEN assign
the spearhead-specific style variables THEN re-enqueue that
seedlet-custom-color-overrides stylesheet.
This puts the customizer color variable assignments AFTER the Spearhead
variable assignments so that those are the values that are used.
* Fix package name, missed escapes, and variable prefixing.
* Remove accidental commit of experimental link color commenting out.
* Remove a line to trigger a diff.
* Remove second translation function.
* Rename menu variable.
* Update theme URI.
* Prefix global message variable.
