`twitfetch.py` fetches the threads defined in `tweets.txt`, and
then the tmux.html has an example (will likely be made a macro
in the future)...

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..

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..