feat: add color modes support

src/styles/style.scss

@@ -4,14 +4,14 @@
 $enable-ltr: true;
 $enable-rtl: true;
 
-// Import styles
-@import "~@coreui/coreui/scss/coreui";
+// Import CoreUI for React components library
+@import "@coreui/coreui/scss/coreui";
 
-// Import Chart.js Tooltips
-@import "~@coreui/chartjs/scss/tooltips";
+// Import Chart.js custom tooltips styles
+@import "@coreui/chartjs/scss/coreui-chartjs";
 
 @import "layout";
 @import "example";
 
-// If you want to add something do it here
+// If you want to add custom CSS you can put it here.
 @import "custom";