Draft: NAL-8 : language-color-yarn-scss

Updated the ska-react-webapp-skeleton with the following with the objective that all GUI development will be able to use this as a starting point.

• Conversion from NPM to YARN ( significant speed improvement due to better dependency algorithms )
• Multiple language support by browser language detection, with English as the default ( Afrikaans implemented as an illustration )
• Support for different date representation depending upon the language of the browser
• Addition of simple buttons to allow for language switching to assist with testing of the previous two items ( annotated out currently )
• Implementation of SCSS to allow for improved styling of applications
• All SKAO colors as listed by the 'brand book' added into SCSS with example of usage
• Sample component added to help illustrate usage of new features
• Testing added to base and sample components to achieve a code coverage of 100%
• Updated to the repository CI processes to use YARN as opposed to NPM ( significant speed improvement due to better dependency algorithms )