Add docs for web server component

Change-Id: I8e23494e86ad0c9aa2bd074c0e19813be774b4fe
diff --git a/doc/source/admin/quick-start.rst b/doc/source/admin/quick-start.rst
index 9993775..77dee4a 100644
--- a/doc/source/admin/quick-start.rst
+++ b/doc/source/admin/quick-start.rst
@@ -33,6 +33,9 @@
       merger if dedicated mergers are not provided.  One or more of
       these must be run.
 
+    - **zuul-web**: A web server that currently provides websocket access to
+      live-streaming of logs.
+
     - **gearman**: optional builtin gearman daemon provided by zuul-scheduler
 
 External components: