📖✨：give the docs an index

[DerekNonGeneric]

/docs/ was five paragraphs of Latin, and the home page links to it. It was
never missing documentation — thirteen real pages already published underneath
it. What was missing was the index that lists them.

The handbook already had its index copy

Every handbook page carries a key_point in its frontmatter: one sentence
stating the rule it makes. A colon indicates that closely-related information
follows. Nine of them, written and invisible — the include that renders them,
_includes/key-point.liquid, is only called from
_layouts/handbook-content-g-devdocs-style.liquid, which no page uses. There
is no devsite markup anywhere in _site/.

So the index puts each rule beside its name. Most lookups end on this page
rather than one page in.

It says what it does not have

Five of the nine handbook pages are placeholders that read "Yet to be written."
They now carry stub: true, and the index reports 4 of 9 written and marks
each one. On a community site a named gap is a job somebody can pick up, and
each of these is small and self-contained.

The count, the flags, and the invitation in the header all read from the same
collection the list is built from, so they cannot drift apart from it.

Nothing here is typed

Two collections in eleventy.config.mjs. A doc appears on the index by
existing. The handbook sorts alphabetically, because reference is consulted by
looking things up; the community docs sort by an order they set, and a doc
without one stays off until somebody places it.

The four docs mirrored from OpenINF/.github keep their summaries in
siteify-health-files.mts beside their titles, so regenerating them does not
drop the text.

Two fixes alongside

The Edit link on every page under /docs/ pointed at
github.com/OpenINF/open.inf.is, which does not exist — the same dead name
behind the README links fixed earlier. Thirteen pages.

head.liquid now prefers a page's own description, which the whole site had
been filling with one site-wide sentence.

Checks

nps test passes, all 17. The page validates. Twelve foreground/background
pairs were computed against the true composited colour, translucent overlays
included, and every one clears AA; most clear AAA. Rendered at 1440, 1024, 820,
and 390, with no horizontal overflow at any of them, and the navbar's own focus
ring confirmed untouched.

Noted, not fixed

.tag-soon on the home page sets $body-bg text on solid $quaternary:
4.33:1 at 11px, under the 4.5:1 floor. It is pre-existing and out of scope
here. This page needed the same "not yet" hue and uses a pale wash with
deep-shade text instead, at 6.91:1.

_home.scss and _docs.scss now both define .wrap and a scoped main
reset. _home.scss:71 predicted this. Lifting the shell into a shared partial
belongs with the stylesheet-seam work rather than here, so this file reads the
Sass variables directly instead of copying the home page's token block.

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