Enabled zooming in Mermaid daigrams. Fixed missing closing backticks in Mermaid example in Editing-the-Wiki.md.

Author: iangillingham-stfc

doc/Editing-the-Wiki.md

@@ -102,7 +102,7 @@ You can then add the image in markdown using the URL `test.png`:
 
 ## Mermaid Diagrams
 Mermaid diagrams can be added using the following syntax (example):
-```
+````
 ```{mermaid}
 ---
 title: Simple sample
@@ -116,6 +116,7 @@ stateDiagram-v2
     Crash --> Develop_software
     Test_software --> [*]
 ```
+````
 
 will render as:
 ```{mermaid}

doc/conf.py

@@ -44,6 +44,7 @@
     # Mermaid diagrams
     "sphinxcontrib.mermaid",
 ]
+mermaid_d3_zoom = True
 napoleon_google_docstring = True
 napoleon_numpy_docstring = False