Remove @raw html decorations if target is Jupyter notebook

[kbarros]

In the context of a notebook output, Literate has the helpful behavior that

```math
\int f dx
```

is replaced with

$$
\int f dx
$$

Please consider an additional transformation where

```@raw html
  <tag> ... </tag>
```

is replaced with just the raw HTML:

  <tag> ... </tag>

It appears that Jupyter notebooks follow a Markdown variant where inline HTML tags are explicitly supported: https://daringfireball.net/projects/markdown/syntax#html

[fredrikekre]

I don't see the connection between that link and Jupyters markdown syntax?

Anyway, this would simply require another regex here:

Literate.jl/src/Literate.jl

Lines 184 to 185 in d59c8c1

	# Replace Markdown stdlib math environments
	push!(repls, r"```math(.*?)```"s => s"$$\1$$")

. Do you want to make PR?

[kbarros]

Thanks for the link. I will make a PR.

For future reference, this link discusses the Markdown allowed in a Jupyter notebook: https://nbformat.readthedocs.io/en/latest/markup.html#what-flavor-of-markdown-does-the-notebook-format-support

Most Jupyter Notebook interfaces use the marked.js JavaScript library for rendering markdown. This supports [CommonMark and GitHub flavored Markdown].

Both of these specifications seem to follow the guidelines in the Gruber link, e.g., allow direct inlining of HTML tags.