Allow Documenter.RawNode through @eval

[asinghvi17]

Markdown backends may sanitize text to avoid HTML detection in Markdown objects, permitting raw nodes may prevent that.

If this makes sense, I can add a test etc.

[mortenpi]

Can you explain the use case here a bit? You have an at-eval block that tries to interpolate a Documenter.RawNode?

In general, I'd like the at-eval blocks to be a bit more powerful in this respect (being able to eval raw HTML into a document can often be handy). But I am not 100% sure exposing RawNode is the right approach.

[asinghvi17]

Specifically I want to interpolate a video tag but only if the page is not in draft mode (otherwise it breaks the Vitepress build)

[mortenpi]

Should we maybe use the standard Docs.HTML for that? I.e. if the block returns that, we'll just convert it to an @raw html node?

[asinghvi17]

That loses the ability to return other forms of raw content, like Markdown, though (Docs doesn't seem to have a markdown thing). Specifically the thing of interest there is to avoid automated markdown sanitization, for example...

Plus, RawNode is sufficiently simple that I don't think it will change much...