Add a bundler/build step to package js dependencies

[7h3kk1d]

Flakiness on unpkg is causing some page load issues to load the ninja keys js from the cdn. We should figure out a bundler or at least vendor this dependency

hazel/src/haz3lweb/www/ninja_module.js

Line 1 in 6df1774

import {NinjaKeys} from 'https://unpkg.com/ninja-keys?module';