Instate an utility to easily migrate from frameworks

[valadas]

One often has to build themes to replace existing ones. For instance, i just had to build a theme to replace bootstrap3 to bootstrap4 and fontawesome4 to fontawesome5. The main issue is that on sites with a lot of content, you often need to rewrite a lot of the content.

Based on a list of bs4 and bs5 equivalent class names, I was able to build a little piece of javascript to automatically replace them. After doing this for one client, I though this might be useful as a utility for any from-to class replacements. It also logs the elements that where replaced to make it easy after the theme implementation to go back and edit content for proper non-replaced classes.

[valadas]

Resolved in #80