Package ui is now only about units except for the Config.Now method.
Remove Now and rename Config to Converter. Add layout.Config to
replace the old ui.Config.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
We're about the split up and finally delete package ui. Move the
instructions link to the second most "top-level" package in Gio,
package app.
Signed-off-by: Elias Naur <mail@eliasnaur.com>