Add server initialization to build script

[ryangyoung]

To view the build output in most (all?) projects you need to:

• Go to the out/ folder
• Run python3 -m http.server
• Devote a terminal session to running that server

It would be delightful if Dactyl, like Docusaurus, just gave you the address of the local server when the build finishes rather than having to re-run the trivial steps above.

[mDuo13]

I wouldn't say it applies to all projects. Depending on the kinds of URLs you use, you can often just open the out/ folder in your browser and click an HTML file to open your browser.