Update PSSS user guide

Aramis-spectral-diagnostics/PSSS-user-guide.md

@@ -54,10 +54,23 @@ The most common reason for a weak signal is the height of the spectrometer cryst
 
 If you know there is a particular control issue with the PSSS (i.e. motion) you can directly contact the controls expert listed below.  For general issues (alignment etc) please use the following contact list: [contacts](Aramis Contacts)
 
-```
+```mermaid
+%%{
+  init: {
+    'theme': 'base',
+    'themeVariables': {
+      'primaryColor': '#825AA6',
+      'primaryTextColor': '#fff',
+      'primaryBorderColor': '#825AA6',
+      'lineColor': '#000',
+      'secondaryColor': '#000',
+      'tertiaryColor': '#fff'
+    }
+  }
+}%%
+
 flowchart TD
-    A[Aramis spectral diagnostics issue] --> B(Chris Arrell)
-    B --> |Not available| C{Type of issue}
-    C -->|Motion control| D[Scott Stubbs]
-    C -->|Spectrum not updating| E[Alex Gobbo]
-    C -->|Data issue| F[Edwin Divall]
+    A{Type of issue}
+    A -->|Motion control| B[Scott Stubbs]
+    A -->|Pipeline| C[Alex Gobbo]
+    A -->|Data issue| D[Edwin Divall]