Dealing with triple-backslash-mermaid vs. triple-backslash-{mermaid}

[cclauss]

The triple-backslash-mermaid syntax works in a README.md file on GitHub (see image below).

```mermaid
Content
```
What is the most convenient and reliable way to add the required braces in the sphinx-build process?
```{mermaid}
Content
```

   sequenceDiagram
      participant Alice
      participant Bob
      Alice->John: Hello John, how are you?
      loop Healthcheck
          John->John: Fight against hypochondria
      end
      Note right of John: Rational thoughts <br/>prevail...
      John-->Alice: Great!
      John->Bob: How about you?
      Bob-->John: Jolly good!

Loading

[cclauss]

Fixed by adding myst_fence_as_directive = ["mermaid"] to conf.py as discussed at

• https://stackoverflow.com/questions/67364913