[pgadmin-hackers][pgaweb][patch] Website patch to add SCSS

In this email you will be able to find the first patches to start the migration of the Styleguide from http://pgadmin4-styleguide.cfapps.io/ to the pgadmin.org webpage.

The first patch adds a Readme to the project and also the yarn.lock file

The second patch:

- Adds SCSS processor to Django

- Scripts to yarn to compile the SCSS and run the application

- Add startapp.sh script to start the application

- Changes the current pgaweb.css file to SCSS

- Update README with new instructions

Thanks

Joao