Automatically detect popular Frontend Frameworks

[fg-j]

What happened?

• What were you attempting to do?
  Build a web app based on React, Vue, or Angular.

• What did you expect to happen?
  The buildpack would be able to tell which framework my app was using and set environment variables like BP_WEB_SERVER_ROOT automatically based on framework defaults/settings.

• What was the actual behavior?
  I had to follow the documentation here to figure out how to manually configure the build.

• Can you provide a sample app or relevant configuration (buildpack.yml,
  nginx.conf, etc.)?
  https://github.com/paketo-buildpacks/samples/blob/6a394a6922b8398f2bc239fd90b245433e6e8ee2/web-servers/javascript-frontend-sample

Checklist

• I have included log output.
• The log output includes an error message.
• I have included steps for reproduction.