Make the menu link styles switches that combine

The one "Link style" select (normal, uppercase, plain) could not give
uppercase links without the bold, or underlined bold links. Bold,
uppercase and the underline (never, on hover, always) are now separate
switches, drawn by blog.css from body classes (Theme.NavClass) so the
theme CSS only colours the links. A stored nav_style is mapped onto the
switches when the theme is read and dropped on the next save; themes
without either keep the bold, underline-on-hover look blog.css always had.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/README.md b/README.md
index 84980bd..27919ef 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,8 @@ Server-rendered HTML, no JavaScript required, works on old browsers and phones.
   set number of pixels, centred or at the left; 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, 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
+  row beside the title or logo. The **menu** mixes blog pages and outside links; its
+  links can be bold, uppercase, underlined always, on hover or never, in any combination. 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).