Code Block

Support for code blocks (and inline code)!

### Inline code

```
This is <code>inline code</code>!
```

### Code block

```
<code lang="js">
  console.log("Hello World!");
</code>
```

### Code block with caption

```
<code lang="js">
  console.log("Hello World!");

  <caption>This is a caption!</caption>
</code>
```

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Code blocks should support syntax highlighting.
