Add a header rule beside the title or logo, and plain menu links

gizmolab's header is a logo with a striped rule filling the rest of the
row, and a menu of plain underlined links under it; nothing in the Design
tab could draw either. The rule (line, dots or stripes) is a theme option
drawn in the header text colour beside the title and logo modules — on
both sides when the header is centred — as table cells, so it is as tall
as the brand and old browsers lay it out the same; it is hidden on phones
so a long title can wrap. The menu's link style gains "plain, underlined"
next to bold and uppercase.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

1 files changed, 3 insertions, 1 deletions

diff --git a/README.md b/README.md
index 828ff20..295fe87 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,9 @@ Server-rendered HTML, no JavaScript required, works on old browsers and phones.
   case; several words match in order with anything in between), custom HTML, footer
   text, RSS link, site map. Column widths are percentages; on phones the columns
   stack under the posts; the header and footer can follow the main column's edges
-  for a centred, single-column look. The **menu** mixes blog pages and outside links. Posts per
+  for a centred, single-column look, and a rule (line, dots or stripes) can fill the
+  row beside the title or logo. The **menu** mixes blog pages and outside links, with
+  bold, uppercase or plain underlined links. Posts per
   page, the date format, the site title size and the footer alignment live here too,
   as does whether listings show whole posts or **summaries** with a "Read more" link
   (a post's summary ends at a `<!--more-->` line, or after its first paragraphs).