Documentation manual: cap intro header width so it flows with the page

ROADMAP.md

@@ -242,3 +242,5 @@ Roughly in priority order:
 `v0.16.58` fixes the Gateway events column-width fix from v0.16.57 not actually taking effect. The table carries two classes, `performance-table event-table`, and the generic `.performance-table th:nth-child(n+2){width:11.1%;text-align:center}` rule sits later in styles.css than the `.event-table` column rules added in v0.16.57 -- at equal CSS specificity, source order decides, so the later generic rule was silently winning and the fixed pixel widths never applied. The `.event-table` column selectors are now written as `table.event-table th:nth-child(n)`, adding the `table` type selector so they outrank `.performance-table`'s rules by specificity regardless of where either appears in the file; the Severity/Category text also moves from centered to left-aligned, matching the Access requests table and removing the awkward centered-in-a-wide-column look that was part of the same complaint.
 
 `v0.16.59` is a release-readiness cleanup pass, prompted by an upcoming public release: a genuine CSS bug, and several stale claims in the in-app Documentation manual that had drifted from what the app actually does after the Certificates/Logs/Runtime work in v0.16.51 through v0.16.58. Fixed: the Documentation page's intro paragraph was rendering in the bright body-text color instead of muted gray, because the CSS rule targeting it used `p:last-child`, which stopped matching once the search box `<div>` was added after it as the real last child -- it now has its own dedicated class instead of relying on element position. In the manual itself: the Certificates overview article said Upstream health only applied to Proxy Hosts (true before v0.16.52, not since); the Certificates field-reference article said certificate detail came from "expanding" a row and that thresholds were set from a nonexistent "Administration -> Security & Health" location (they're on the Certificates page itself, both predating and unrelated to this session's changes); the Dashboard and System articles' Scheduled Jobs lists were missing the database-integrity and disk-usage-refresh jobs added in v0.16.56; the System article still claimed the Disk usage breakdown showed total/remaining capacity, which moved to the Runtime panel's Disk stat in v0.16.57; and neither the Dashboard nor System Runtime sections mentioned the value-text threshold coloring added in v0.16.57. The Logs article also picked up one clarifying sentence noting Gateway Events now has the same pinned column-header behavior as Access Logs. Outside the app: the README version badge and the ZimaOS App Store manifest's `version`/`update_at` fields were several releases stale (0.16.50 and 0.11.101 respectively) and are now current.
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+`v0.16.60` fixes the Documentation manual's intro header, which sat as a full-width bordered panel with no cap on its content width -- on wide screens the eyebrow, heading, and lede paragraph (already capped at 850px) left a large block of empty space to their right inside the panel, since nothing constrained the panel itself. The intro block now has its own max-width (900px), centered within the page the same way the rest of the manual's reading column is, so the header reads as one balanced block instead of left-aligned text trailing off into open space.