Instructions for graphics application worker machine (#87)

* document email configuration

* instructions for graphics worker

Author: bmcutler

_data/links.yml

@@ -75,11 +75,15 @@
     - name: Course Creation
     - name: Setting up Internal Git
       link: git
+    - name: Worker Installation
+      link: worker_installation
     - name: System Customization Checklist
       link: system_customization
     - name: Email Configuration
       link: email_configuration
     - name: Student Auto Feed
+    - name: Course Archiving
+      link: course_archiving
 
 - name: Developer
   children:

_docs/sysadmin/worker_installation.md

@@ -1,7 +1,6 @@
 ---
 title: Worker Installation
 category: System Administrator
-order: 2
 ---
 
 A Submitty instance is capable of leveraging additional machines to distribute
@@ -87,3 +86,16 @@ The user should only be used for submitty related activities.
     required_capabilities : 'CAPABILITY'
   ```
   to ship your jobs to a worker with the capability CAPABILITY.
+
+
+# Additional Instructions for Graphics Application Workers
+
+1. Make sure the display will not go to sleep
+
+   __FIXME: add instructions__
+
+2. Give the untrusted user access to the Xserver
+
+   ```
+   xhost + SI:localuser:untrusted00
+   ```