Improve, restructure documentation and add screenshot

docs/debian_installer/setup_debian_6_setup_codeocean.sh

@@ -0,0 +1,28 @@
+############# codeocean install ###########################
+cd /home/debian/codeocean_host
+
+#install rails and bundler
+echo "Install Rails..."
+gem install rails
+echo "Done"
+echo "Install Bundler..."
+gem install bundler
+echo "Done"
+
+# install required gems
+bundle install
+
+# copy config files
+for f in action_mailer.yml database.yml secrets.yml sendmail.yml smtp.yml code_ocean.yml
+do
+  if [ ! -f config/$f ]
+  then
+    cp config/$f.example config/$f
+  fi
+done
+
+# Manual Task:
+# if necessary adjust db config
+echo "Check if settings in database.yml correspond with your database setup."
+
+cat /home/debian/codeocean_host/config/database.yml