message: Show proper error if `start` and `now-start` scripts are missing
diff: +// Native
  const { basename, resolve: resolvePath } = require('path');
  +
  +// Packages
  const chalk = require('chalk');
  const { readFile, exists } = require('fs-promise');
  const { parse: parseDockerfile } = require('docker-file-parser');
  +// Helpers
  +const { error } = require('../lib/error');
  +
  const listPackage = {
  scripts: {
  start: `NODE_ENV='production' serve ./content`
  @@ -71,9 +77,10 @@ async function readMetaData(
  try {
  pkg = JSON.parse(await readFile(resolvePath(path, 'package.json')));
  } catch (err) {
  - const e = Error(`Failed to read JSON in "${path}/package.json"`);
  - e.userError = true;
  - throw e;
  + error(`Failed to read JSON in "${path}/package.json"`);
  +
  + // eslint-disable-next-line unicorn/no-process-exit
  + process.exit(1);
  }
  }
  @@ -81,12 +88,13 @@ async function readMetaData(
  strict &&
  (!pkg.scripts || (!pkg.scripts.start && !pkg.scripts['now-start']))
  ) {
  - const e = Error(
  + error(
  'Missing `start` (or `now-start`) script in `package.json`. ' +
  'See: https://docs.npmjs.com/cli/start.'
  );
  - e.userError = true;
  - throw e;
  +
  + // eslint-disable-next-line unicorn/no-process-exit
  + process.exit(1);
  }
  if (!deploymentName) {
  