Code blocks that allow to open them in Val Town should specify the type of a Val

[Xkonti]

Let's say there's a code block that presents how to create an API using Hono:

```ts val
import ...
// Do other stuff
```

If user will click "Open in Val Town" the new Val won't be of type HTML introducing more friction and probably confusing some new users.

Solution proposal

If supported in val.town/new it could be achieved by appropriately marking code blocks with meta:

• val - the existing marking would create regular script vals
• val-script - explicitly specifies a script val
• val-http - explicitly specifies http val
• val-cron - scheduled val
• val-email - email val

It would be really easy to extract that info in the current code block processor and pass to the URL.

[stevekrouse]

Excellent idea!!!