Follow the sphinxcontrib-mermaid docs

Because I was too dumb to just [read the docs](https://sphinxcontrib-mermaid-demo.readthedocs.io/en/latest/) to begin with

docs/conf.py

@@ -47,6 +47,7 @@
 myst_fence_as_directive = ["mermaid"]
 # optional to use directive options
 myst_enable_extensions = ["attrs_block"]
+mermaid_params = ['-p' 'puppeteer-config.json']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

docs/puppeteer-config.json

@@ -0,0 +1,3 @@
+{
+  "args": ["--no-sandbox"]
+}