not all are replaced as they could be confused for regular chars
(like x for times and - for non-breaking hyphen), so those will not
be changed..

css checking w/ the html checking as that works.. saves on invocation
of java..

files in it's own pass, and use find to identify them, since their
path name matching is broken..

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...