[!!!][TASK] Refactor Scss, add Sass-lint and adjust styling

Add variables to allow easy modifications to color, font and also extending Style

scss/custom/_custom.scss

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+// Example of overwriting variables. Take a look at modules/variables
+// .node-links {
+//    color: $color-primary;
+// }
+
+// You can also include additional files for style example https://github.com/ffrgb/meshviewer/tree/ffrgb-config/scss/custom
+// Include syntax: @include "name" -> Filename: _name.scss
+
+// SCSS supports css with a lot of additional features like variables or mixins.
+// Autoprefixer runs in postcss, no need to add browser-prefixes like -webkit, -moz or -ms

scss/custom/_variables.scss

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+// Example of overwriting variables. Take a look at modules/variables
+//$color-black: #fff;
+//$color-white: invert($color-white);
+//$color-primary: invert($color-primary);