remove non web standard usages of CSS

[thescientist13]

As a "getting started" template, it would stand to reason that it probably should only promote web standards, which in this repo is conflicted due to usages of:

1. nested CSS
2. import for CSS files

Examples

1. https://github.com/ProjectEvergreen/greenwood-getting-started/blob/master/src/components/footer/footer.css
2. https://github.com/ProjectEvergreen/greenwood-getting-started/blob/master/src/components/footer/footer.js

What we should do here is the following

1. For any instances of import xxx from some.css, put that right into the JavaScript template, e.g.

   // create templates that interpolate variables and HTML!
   getTemplate() {
   
     return `
       <style>
         /* contents of CSS file goes here instead */
       </style>
     
       /* some HTML code */
     `;
   }

2. Un nest any of that CSS
3. Remove dependency on @eve-container/eve-container and replace with FlexBox / Grid equivalent

---

This will be important as the next version of Greenwood, while custom PostCSS plugins will still be supported, it wont be by default, so if a project wants to use nested CSS, that's great, they can by just installing it into their project.