add missing import macro...
X-UA-Compatible is no longer useful..
name -> id
various mismatched tags..

[1] https://validator.w3.org/feed/

https://stackoverflow.com/questions/3558119/are-non-void-self-closing-tags-valid-in-html5

This causes issues w/ the atom blog as it puts html tags in the middle
of an html document where they shouldn't be..

more explicite...  It'd be nice to put everything in a div or something
that would scroll all the pre > code elements, but don't know how now..

make the font a bit smaller, but larger on the sidebar...

move styling for sidebar into css from style attribute..

make sure my custom css can override the tufte css (to allow setting
the font size)..

convert the slug into a macro so it can be used else where

make the title link to a slug, but use -title since the bare
slug is the body which doesn't make it go to the title of the
blog post...

make a few of the side bar elements bold (the year and the month)..

as the months are always displayed, it just looks bad to add them there..

This is used for sidebar navigation..  the committed w3.css file has
a few fixes applied to it, see the NOTES.md for more info..

these are based upon slight modifications from the basic template...

they still need to be proofed to make sure they got fully converted.

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.