Until now, making static files end up in the same output directory as an
article that links to them has been difficult, especially when the article's
output path is generated based on metadata. This changeset introduces the
{attach} link syntax, which works like the {filename} syntax, but also
overrides the static file's output path with the directory of the
linking document.
It also clarifies and expands the documentation on linking to internal content.
The "Getting Started" docs became overly long and unwieldy over time.
This splits it into separate sections, including:
* Quickstart
* Installation
* Writing content
* Publish your site
