Toggling light/dark mode breaks mermaid diagrams

[antonpirker]

Steps to Reproduce

• Go to https://develop.sentry.dev/application/architecture/
• Toggle light/dark mode
• The diagram is now gone and some css is printed.

Expected Result

The mermaid diagram should render with right theme set.

Actual Result

The mermaid component breaks and just prints some CSS.

Additional Info

Thats the code where we set the mermaid theme:

https://github.com/getsentry/sentry-docs/blob/master/src/components/mermaid.tsx#L29