org mode allows rendering the toc anywhere in the html document using the `TOC`
keyword [1]. There's more options but `#+TOC: headlines $n` should be enough
for starters. Note that org mode still requires setting `#+OPTIONS: toc:nil` to
disable the default toc
[1] https://orgmode.org/manual/Table-of-Contents.html
Org mode separates kvs not as initially assumed by whitespace (~ csv) but
rather at keywords (~ :\w+).
This is still not replicating Org mode behaviour though as I decided against
attributes ignoring multi-definitions. Instead we stack their
values (and those existing on the element) for certain attributes (class, style
for now).
e.g.
[[foo]]
would become <foo class="a"> in Org mode but becomes <foo class="a b"> with
go-org.
