Fix/60

[Simply007]

Motivation

Fixes #60

Also, remove one hardcoded asset from #17

• Add information about data sources to the readme and inform about the in the info message when user selects the project.
• Rebuild Banner component to be dynamic and displays the first hero unit.
  • Also prepared infrastructure for A/B testing (all hero unit banners are loaded) - so just a logic that selects which banner to use based i.d. query string, etc could be used

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[makma]

Code works as expected, the readme is didactic. I've introduced one more change since it seems the original vue-i18n-loader has been deleted from the npm registry. I've replaced it with @intlify/vue-i18n-loader. Other changes look good.