Generate link to the source file after code snippet

[Tomas2D]

We are using your library to embed code examples in our documentation (pure Markdown files).
We would like to include a link to the source file so a user can open it.

Input:

Hello world!

<!-- embedme examples/a.ts -->

```ts
```

Output:

Hello world!

```ts
const foo = "bar"
```

Source: [examples/a.ts](./examples/a.ts)

[zakhenry]

This would need to be a bit more complex than this because we'd likely need to have a base url passed as relative links on the generated site might not line up with the source code