a post with diagrams

This theme supports generating diagrams from a text description using Mermaid. Diagrams are rendered in the browser by the al_charts plugin; no separate Mermaid CLI installation is needed.

Mermaid

The diagram below is generated by the following code:

```mermaid
sequenceDiagram
    participant John
    participant Alice
    Alice->>John: Hello John, how are you?
    John-->>Alice: Great!
```

sequenceDiagram
    participant John
    participant Alice
    Alice->>John: Hello John, how are you?
    John-->>Alice: Great!