Update install.md

dockers/install.md

-== Setup instance
+## Setup instance
 Based on Christians cloud-init file:
+`
 #cloud-config
 
 # upgrade packages
@@ -15,12 +16,19 @@ packages:
 runcmd:
   - usermod -aG docker ubuntu
 
+`
+
 Think about the security group for the isntance (e.g. to enable access to webgut 7001 port should be open). There is airflows group in HDF. 
 
-== Prepare env
+## Prepare env
+
+`
 mkdir ./dags ./logs ./plugins
 echo -e "AIRFLOW_UID=$(id -u)\nAIRFLOW_GID=0" > .env
 docker-compose up airflow-init
+`
 
-== Start-up
+## Start-up
+`
 docker-compose up -d
+`