fix: @babel/polyfill not found in Docker container

[emcniece]

Applies the fix from #803 to the Docker entrypoint script so that the Docker images can run properly.

This is not fully functional yet: when accessing the app from the browser an error displays and the container logs out:

2023-05-17T03:29:37.666Z - info init Loading configuration from "/root/.cncrc"
(node:1) Warning: Accessing non-existent property 'padLevels' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
2023-05-17T03:29:37.725Z - info init Starting the server at http://172.17.0.2:8000
Error: Failed to lookup view "index.hbs" in views directories "/opt/cncjs/app" or "/opt/cncjs/server/views"
    at Function.render (/opt/cncjs/node_modules/express/lib/application.js:580:17)
    at ServerResponse.render (/opt/cncjs/node_modules/express/lib/response.js:1008:7)
    at /opt/cncjs/server/app.js:66:9
    at Layer.handle [as handle_request] (/opt/cncjs/node_modules/express/lib/router/layer.js:95:5)
    at next (/opt/cncjs/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/opt/cncjs/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/opt/cncjs/node_modules/express/lib/router/layer.js:95:5)
    at /opt/cncjs/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/opt/cncjs/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/cncjs/node_modules/express/lib/router/index.js:275:10)
    at Layer.handle [as handle_request] (/opt/cncjs/node_modules/express/lib/router/layer.js:91:12)
    at trim_prefix (/opt/cncjs/node_modules/express/lib/router/index.js:317:13)
    at /opt/cncjs/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/cncjs/node_modules/express/lib/router/index.js:335:12)

To remedy this, index.hbs is copied into the server directory. Now when accessing the app in browser a loading icon appears, but nothing happens. There are no terminal or JS console logs.

I'm not sure if this is the correct approach for fixing the HTML templating, need to investigate. @cheton any suggestions? 🙏

Resolves #829 and #826.

[emcniece]

Thank you for the help!