cheat sheet
works with or without a space between the text and the double dash.
text -- text -> text—text
`text` -> text
**text** -> text
*test* -> text
[visible text](url)
^ text to which footnote is added
footnote
more footnote
^
>
note
more note
>
{ image-url
margin note
more margin note
{
} image-url
note
more note
}