specify drone 0.4 in docs

Makefile

@@ -53,6 +53,7 @@ vendor:
 
 docs:
 	mkdir -p /drone/tmp/docs
-	cp -a static/docs_gen/*  /drone/tmp/docs/
-	cp -a static/styles_gen  /drone/tmp/docs/
-	cp -a static/images      /drone/tmp/docs/
+	cp -a static/docs_gen/*   /drone/tmp/docs/
+	cp -a static/scripts_gen  /drone/tmp/
+	cp -a static/styles_gen   /drone/tmp/
+	cp -a static/images       /drone/tmp/

docs/setup/install.md

@@ -2,6 +2,12 @@
 
 To quickly tryout Drone we have a [Docker image](https://registry.hub.docker.com/u/drone/drone/) that includes everything you need to get started. Simply run the commend below:
 
+```
+sudo docker pull drone/drone:0.4
+```
+
+And then run the container:
+
 ```
 sudo docker run \
 	--volume /var/lib/drone:/var/lib/drone \
@@ -11,7 +17,7 @@ sudo docker run \
 	--publish=80:8000 \
 	--detach=true \
 	--name=drone \
-	drone/drone
+	drone/drone:0.4
 ```
 
 Drone is now running (in the background) on `http://localhost:80`. Note that before running you should create the `--env-file` and add your Drone configuration (GitHub, Bitbucket, GitLab credentials, etc).