The old image had joins when it repeated. RReplace with a bitmap
of colour 8000ba with GIMP Aristic/Clothify filter applied with
Blur X/Y 20 and depth 1.
Move text to 5px margin, which combined with the 5px margin specified
in the banner CSS gives a 10px margin for text, matching the content.
Give buzzard more of a vertical margin.
The previous bitmap had green tinges around the main wording. And I wanted
to have 'Cry Havoc Botley Morris' around the buzzard.
Also add the Inkscape SVG used to generate the banner bitmap.