release: 1.8.0: Built-in operator help drawer and /help page

Built-in operator documentation in the panel: a CSS-only help drawer and Help page so Status checks and domain controls are explained without leaving the panel.
Added:
  - **Help** navigation entry and `/help` index page.
  - CSS-checkbox help drawer (no extra script): seeded topics for Status (Machine,
  - «?» entry points on Status and domain card heads open the matching drawer
Changed:
  - [guide.md](docs/guide.md) documents the boundary: in-panel help for card

Full detail: CHANGELOG.md (1.8.0).

internal/web/web.go

@@ -159,6 +159,8 @@ func (s *Server) Handler() http.Handler {
 
 	authed := http.NewServeMux()
 	authed.HandleFunc("GET /{$}", redirectHome)
+	authed.HandleFunc("GET /help", h.HandleHelp)
+
 	authed.HandleFunc("GET /status", h.HandleStatus)
 	authed.HandleFunc("GET /status/fragment", h.HandleStatusFragment)
 	authed.HandleFunc("POST /status/recheck", h.HandleStatusRecheck)