~fgaz/wasp-os-web-builder

Remove leftover worker.tcl

I forgot to remove it in 06e9de85bf0c86cb25e95cbcf30038906b354631
Add short help text
Add footer with attribution
Clean up config variables
Status page style
Unify worker and cgi script

We already have a long-running worker, we might as well make it serve
HTTP/SCGI requests. This way we avoid all the complexity of passing data
over comm.

The only pain point is the underdocumented httpd from tcllib.
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