style(base.scss): remove empty line at the end of the file for consistency

style(nav.scss): remove unused import statement for mixins in _core folder

assets/scss/_core/_base.scss

@@ -17,4 +17,3 @@ a,
 button {
   cursor: pointer;
 }
-

assets/scss/_partial/_nav.scss

@@ -1,4 +1,3 @@
-@import '../_core/mixins';
 $tablet: map-get($breakpoints, 'tablet') - 1;
 
 nav {