Replace inline backtick math in notebooks

[mortenpi]

Literate replaces the ```math blocks with $$s when run outputting notebooks:

Literate.jl/src/Literate.jl

Line 163 in c1dce7f

push!(repls, r"```math(.*?)```"s => s"$$\1$$")

But not the inline elements (foo ``x^2`` bar), which then don't render properly (would need $s). Should we also add e.g. this:

push!(repls, r"``(.+)``" => s"$\1$")

to the default replacements?

[mortenpi]

I noticed that the original regex was overly greedy. This one seems to work better (matches everything between 2 backticks, except for newlines and backticks):

r"``([^`\n]+)``" => s"$\1$"

[moustachio-belvedere]

This would be very nice to have for documentation I'm working on. I'm not knowledgeable enough to create a PR, but I was wondering if there is a temporary work-around that can be used?

Edit: For now I can get by using unicode symbols directly, but still curious if there is a workaround as it would allow more flexibility.