Improve developer experience for the web UI

[nicomiguelino]

Overview

• Configured the anthias-server service to install Node.js and NPM.
• Added an NPM script that compiles .coffee files to .js files in watch mode.

Checklist

• [x] The CoffeeScript transpiler should work properly.
• [x] The SCSS transpiler should work properly.

Limitations

• JavaScript files generated by the CoffeeScript transpiler are not included in .gitignore. We'll not be including this in this PR.
• Using a bundler like Webpack or Parcel might be implemented in future PRs.