Switch to sass-gradle-plugin

[mfl28]

• Switches from LibSassGradlePlugin to sass-gradle-plugin.
• Outputs generated css-stylesheet to build directory instead of source resources folder, thereby fixing build error when no previous stylesheet.css file exists. Therefore stylesheet.css is removed from source resource folder.

Closes #8 .

[codecov]

Codecov Report

Merging #9 (fbfa0da) into master (4577ca0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #9   +/-   ##
=========================================
  Coverage     83.05%   83.05%           
  Complexity     1195     1195           
=========================================
  Files            86       86           
  Lines          5429     5429           
  Branches        474      474           
=========================================
  Hits           4509     4509           
  Misses          676      676           
  Partials        244      244           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information