Add docs for setting up Steam Headless on Intel GPU with docker-compose

docs/compose-files/.env

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+# Docker config
+## DOCKER_RUNTIME:
+##      Options:        ['runc', 'nvidia']
+##      Description:    The name of an implementation of OCI Runtime Spec
+##                      Available runtimes are listed when you run `docker info`. 
+##                      Your system may have other options available. As a simple rule, if you are
+##                      using an NVIDIA GPU, set this to 'nvidia' for anything else, set this to 'runc'.
+DOCKER_RUNTIME='runc'
+
+# Container mode config
+## MODE:
+##      Options:        ['primary', 'secondary']
+##      Description:    Steam Headless containers can run in a secondary mode that will only start
+##                      a Steam process that will then use the X server of either the host or another
+##                      Steam Headless container running in 'primary' mode.
+MODE='primary'
+## WEB_UI_MODE: 
+##      Options:        ['vnc', 'neko', 'none']
+##      Description:    Configures the WebUI to use for accessing the virtual desktop.
+WEB_UI_MODE='vnc'
+## ENABLE_VNC_AUDIO: 
+##      Options:        ['true', 'false']
+##      Description:    Enables audio over for the VNC Web UI if 'WEB_UI_MODE' is set to 'vnc'.
+ENABLE_VNC_AUDIO='true'
+
+# Default user config
+PUID='1000'
+PGID='1000'
+UMASK='000'
+USER_PASSWORD='password'
+
+# System config
+HOSTNAME='SteamHeadless'
+TZ='Pacific/Auckland'
+USER_LOCALES='en_US.UTF-8 UTF-8'
+DISPLAY=':55'
+SHM_SIZE='2G'
+
+# Nvidia specific config (not required for non Nvidia GPUs)
+NVIDIA_DRIVER_CAPABILITIES='all'
+NVIDIA_VISIBLE_DEVICES='all'