Fix dockerfile and add a quick test

See readme for instructions

README.md

@@ -17,17 +17,27 @@ Nginx is configured to:
 
 Conf is in /etc/nginx/sites-available/default
 
+Test
+----
+
+```
+docker run --rm -it -v $PWD/templates:/data zetikettes /bin/bash /root/zetikettes/mkjam.sh
+```
+
+This should produce a .pdf in `templates/`. Open it to check that
+layout & fonts are correct.
+
 Run
 ---
 
 ```
-docker run -d --rm -p 8000:8000 -v /var/lib/zetikettes/templates:/data zetikettes
+docker run -d --rm -p 127.0.0.1:8000:8000 -v /var/lib/zetikettes/templates:/data zetikettes
 ```
 
 Change available templates
 --------------------------
 
-1. go to /zetikettes/newtikette.html
+1. go to /zetikettes/newtikette.html or konami code from main app
 1. add the newtikette
 1. still no need to restart the container (magic!)
 2. profit.