Simplify version of the angular footer

In order to build an angular directive, I have tested whether I can
build a footer version without using `generator-angular` (and all the
packages that installs without knowing what they are). This
`footer-minimal` version includes:
- A folder to implement a minimal version `footer_minimal`
- The `styles` folder contains the `.css` files
- The `script` folder contains the angular scripts
- Using angular controller to build the first dynamic minimized version.