Various minor cleanups and add Webpack automation

[whitfin]

This PR comes with a bunch of stuff:

• Removes two dependencies which are no longer used (afaict).
• Fixes the names of 3 resources to match the correct case.
• Removes some unnecessary timeouts, and adds a sauce.timeout convenience function.
• Correctly waits for htmlToImage.toCanvas to conclude before re-trying.
• Allows Webpack to use NODE_ENV rather than hardcoded to development.
• Adds a GitHub Action to automatically build and push dist, only on commits into main.

Feel free to reject any of the above, kinda just did them for fun :)

I stopped short of some more involved changes, specifically around overlay positioning, but I might follow up with those later (in a different PR).

[NadyaNayme]

Everything looks good to me -and thank you again for doing all this I really appreciate it. :)