settings: system card on the landing page

The landing page was a paragraph of About text. It now carries the
project's name, Keystone, a short About, and a system card: the
Slackware facts of conky-theme-udt's card (version, package count,
kernel, install age, and the slackpkg ChangeLog age, green under a day,
yellow under a week, red past it), the machine, and base library and
development tool versions, in two columns. The page scrolls once it
outgrows the window.

Everything comes from one sh process per open of the window, so there
is no cache file and no dependency on conky's sampler. Library and tool
versions are read from the installed package names in
/var/log/packages: the version must start with a digit, so gcc does not
also match gcc-g++, and stops at an underscore, which drops qt6's
snapshot suffix. A package that is not installed shows a dash.

The shortcut walkthrough left the About text: the drawer, island and
assistant are described in their own READMEs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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