refactor: move the public host out to vantage-site and vantage-docs

site/ and sitesvc/ become web/ and server/ in vantage-site; docsite/
becomes the root of vantage-docs. Their images move with them, to
vantage/vantage-site/{web,server} and vantage/vantage-docs.

Nothing here imported any of them, and sitesvc turned out to read no
database at all, so both cuts are clean. docker-compose.site.yml is
deleted rather than emptied: every service it held now ships with the
repository that builds it, and deploy/docker/docker-compose.yml is once
again exactly a self-hosted install.

Corrects four comments that named sitesvc for work it no longer does.

server/internal/models/instance.go

@@ -2,6 +2,6 @@ package models
 
 import shared "gitea.hostxtra.co.uk/vantage/vantage-shared/models"
 
-// Instance is defined in the shared module because sitesvc and the admin
-// control plane write the same documents.
+// Instance is defined in the shared module because the control plane and
+// Vantage HQ write the same documents from separate repositories.
 type Instance = shared.Instance

server/internal/services/coreindexes.go

@@ -25,7 +25,7 @@ func EnsureAuthIndexes() error {
 	defer cancel()
 
 	// users.email and instances.slug are declared in the shared module so the
-	// control plane and sitesvc cannot disagree about them.
+	// control plane and Vantage HQ cannot disagree about them.
 	if err := indexes.EnsureCoreIndexes(ctx, db.Database); err != nil {
 		return err
 	}

server/internal/services/instances.go

@@ -101,9 +101,9 @@ func AdoptInstance(instanceID, name string) (*models.Instance, error) {
 
 // CreateInstance creates an organisation and seeds its default workflow steps.
 //
-// The creation rules live in shared/provision because sitesvc creates
-// organisations too. Seeding stays here: shared must not know about workflow
-// steps.
+// The creation rules live in shared/provision because Vantage HQ's cloudprov
+// creates instances too, from another repository. Seeding stays here: shared
+// must not know about workflow steps.
 func CreateInstance(name string) (*models.Instance, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()