emily: update documentation to include maintenance tips.

git.adelielinux.org/README

@@ -32,6 +32,18 @@ Debug logs can be viewed at:
 
   $ docker-compose logs
 
+To restart ONLY Emily, but use the old configuration:
+
+  $ docker-compose restart emily
+
+If you wish to rebuild Emily (e.g. with new configuration):
+
+  $ docker-compose build
+
+To restart ONLY Emily, but use the new configuration:
+
+  $ docker-compose up -d --no-deps emily
+
 
 license
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