The issue is that w/ mark'd sections, the anchors will be relative
to the imported doc and NOT the source document..  So the markdown
toc feature that adds anchors to header tags would create permanent
links that won't work in the long term.  This fixes them up.

page working...  This is more documented in NOTES.md, which will
be committed shortly..

Slight modifications to Tufte to have some space on the right, and
add a custom.css to style the tags a bit better...

We can drop article.j2 as it was a test and isn't needed anymore,
and macros.j2 is empty now, and may be used for other things in
the future...

duplicated..  This is to freeze a working version before I try
to make macros work via call blocks...