Support LaTeX rendering

[Schwefelhexa]

Allow users to render LaTeX by wrapping the code in $-tags.
This is part of GFM, as well as GLFM.

I'd be willing to help with the implementation.

[neurosnap]

Greetings! We will happily review any PRs to support this feature!

[neurosnap]

For anyone wanting to work on adding latex rendering:

pico/shared/mdparser.go

Line 184 in e445a79

md := goldmark.New(

[Schwefelhexa]

Sorry for taking so long, uni exams had me pretty busy.
PR is now up

[geek-9]

meybe add some graph diagrams?
graphviz, tikz
or simple
groff
for example :

.PS
box "box1";
line
box "box2";
.PE

+------+     +------+
|      +-----|      |
| box1 |     |box2  |
+------+     +------+

https://github.com/blampe/goat
I like svg too ;)