net::ERR_SSL_PROTOCOL_ERROR

[MarcoI]

Solved the problem thanks to Francis Daly who pointed me to the right
direction: 
  https://forum.vuejs.org/t/vue-with-nginx/26843/3

    // vue.config.js
    module.exports = {
      // options...
      publicPath: '',
      devServer: {
        host: '0.0.0.0',
        port: 8080,
        public: 'ggc.world'
      },
    }

Now it works fine:
https://drive.google.com/open?id=1PUctgdYLoVmJRvYyG040BFNGOev2yhRX

Besides to Francis, whose contribution was resolutive, I thank J.S. and
Reinis for their kind help.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,286991,287001#msg-287001