Produce a static website

[rudolfbyker]

Is your feature request related to a problem? Please describe.
The problem is that it's possible to run a server to view the files, but not to deploy a static website (containing just HTML and CSS (and maybe JS) files) which can be viewed without a server, and/or deployed to a simple nginx server.

Describe the solution you'd like

This should convert the entire workspace archive to a locally-browseable static site.

slackdump convert -o bar -output html foo

Describe alternatives you've considered

Do slackdump view foo and then run a web scraper on that.