feat(11.1-04): add the Database section and the core Services pages

- docs/database: models, migrations, queries and pagination, relations,
  casts and validation, attachments and transactions (lagoon.Transaction,
  lagoon.AfterCommit, nested savepoints, lagoon.OnDatabase)
- docs/services: configuration, events, routing with auth groups, rate
  limiting, authentication, the OAuth server, mail and localization
- runnable Examples for lagoon, attach, compass, surf, wire, bouncer,
  wristband, postcard, phrasebook and festival; lagoon TestDocs* regions
  run on the package's Postgres harness through DocsDB
- 15 new required pages

cmd/summer/docs_test.go

@@ -94,6 +94,21 @@ var requiredPages = []string{
 	"console/writing-commands",
 	"console/utilities",
 	"services/jobs",
+	"database/models",
+	"database/migrations",
+	"database/queries-and-pagination",
+	"database/relations",
+	"database/casts-and-validation",
+	"database/attachments",
+	"database/transactions",
+	"services/configuration",
+	"services/events",
+	"services/routing",
+	"services/rate-limiting",
+	"services/authentication",
+	"services/oauth-server",
+	"services/mail",
+	"services/localization",
 }
 
 // TestDocsRequiredPages asserts that every required page is in the loaded