Escaping of quotes and <> in code blocks is broken

[lidel]

If we have:

```console
[..]
$ curl "http://127.0.0.1:8080/ipfs/$DIR_CID?format=tar" | tar xv
[..]
```

Then it produces:

<div class="remark-highlight"><pre class="language-console"><code class="language-console">
[..]
$ curl &amp;quot;http://127.0.0.1:8080/ipfs/$DIR_CID?format=tar&amp;quot; | tar xv
[..]
</code></pre></div>

because of <pre> it show up mangled in browser, see https://specs.ipfs.tech/ipips/ipip-0288/#user-benefit

[lidel]

Same problem with <> surfaced in ipfs/specs#431:

<Response body as CARv1 stream> <0x00 byte> <Metadata>

produces: