different shades to distinguish nesting level of table of contents
less space between paragraphs
background color for code blocks
increase line-height
site.url is filled in automatically
copy download page from metaborg.org
NaBL documentation from metaborg/doc
index for SDF3 documentation
Index for QL tutorial
index for editor-services documentation
index for Spoofax tutorials
index for TS documentation
index for dev/ section
index for Strategy documentation