feat(11.1-04): add the Services section with a verified Queued jobs page

- docs/services/jobs.md: declaring, registering and dispatching jobs, the
  summer_jobs record, progress, cancellation and workers
- conga ExampleJob plus dispatch and status regions run by TestDocsDispatch
  on the package's Postgres harness (DocsApp in export_docs_test.go)
- concept map links the queued jobs row; services/jobs is a required page

docs/setup/coming-from-wintercms.md

@@ -30,7 +30,7 @@ Each row names the WinterCMS concept, the SummerCMS identifiers that replace it
 | `Event::listen` and `Event::fire` | `festival.Bus.Listen` and `festival.Bus.Fire` on `backpack.App.Events`, keyed by the event's Go type | [festival](../../modules/festival/README.md) |
 | `App::make` and singleton bindings | `backpack.App.Publish` and `backpack.App.Lookup`, keyed by type | [backpack](../../modules/backpack/README.md) |
 | Artisan commands and `registerConsoleCommand` | `bonfire.Command` values returned from `pact.HasCommands` | [bonfire](../../modules/bonfire/README.md) |
-| Queued jobs | `pact.HasJobs` with jobs built by `conga.Job`, dispatched with `conga.Manager.Dispatch` inside the caller's transaction | [conga](../../modules/conga/README.md) |
+| Queued jobs | `pact.HasJobs` with jobs built by `conga.Job`, dispatched with `conga.Manager.Dispatch` inside the caller's transaction | [Queued jobs](../services/jobs.md), [conga](../../modules/conga/README.md) |
 | `registerSchedule` and the scheduler | `pact.HasSchedule` returning `pact.ScheduledCommand` entries with a `pact.Cadence` | [pact](../../modules/pact/README.md) |
 | Mail templates in `views/mail` | `pact.HasMailTemplates`, sent through `postcard.Mailer` | [postcard](../../modules/postcard/README.md) |
 | Settings models and `registerSettings` | `pact.HasSettings` returning `pact.SettingsItem` entries | [cabana](../../modules/cabana/README.md) |