Adjust order and make sure all services in the figure are listed

documentation/operator-guide/intro.rst

@@ -19,18 +19,17 @@ The View Server consists of the following service components (with their
 respective Docker image in parenthesis):
 
 - Reverse proxy (traefik)
-- Preprocessor (preprocessor)
-- Registrar (core)
-- Renderer (core)
+- Web Client (client)
 - Cache (cache)
+- Renderer (core)
+- Registrar (core)
 - Seeder (cache)
-- Client (client)
+- Preprocessor (preprocessor)
+- Ingestor (ingestor)
 - Database (postgis)
 - Queue Manager (redis)
 - Log collector (fluentd)
 
-.. - Ingestor (ingestor) TODO: re-add this
-
 These services are bundled and managed together in a Docker Swarm via
 Docker Compose configuration files.