Adjust masthead colour strip height to 0.5em
Only apply section numbering to long-form works.
s/docbook-links/docbook-styles/; to better reflect what it is; apply RES global navigation to DocBook samples
Add local stylesheet for DocBook samples
Replace true(1) manual page with fictional sample(1)
Update to current docbook-html5
Reorganise structure of sample book to more closely match Painting by Numbers
Update edition date
Re-generate from sources.