refactor: remove rtl.scss from main.scss and move to _scss/base

Author: zakariaf

_sass/base/_index.scss

@@ -2,3 +2,4 @@
 @forward 'base';
 @forward 'typography';
 @forward 'syntax';
+@forward 'rtl';

_sass/rtl.scss renamed to _sass/base/_rtl.scss

@@ -1,9 +1,9 @@
 /* RTL Styles for Jekyll-Theme-Chirpy
  * This file provides RTL overrides for the theme
  */
-@use './abstracts/variables' as v;
-@use './abstracts/breakpoints' as bp;
-@use './abstracts/mixins' as mx;
+@use '../abstracts/variables' as v;
+@use '../abstracts/breakpoints' as bp;
+@use '../abstracts/mixins' as mx;
 
 html[dir='rtl'] {
   $sidebar-display: 'sidebar-display'; /* the attribute for sidebar display */

_sass/main.scss

@@ -2,4 +2,3 @@
 @forward 'components';
 @forward 'layout';
 @forward 'pages';
-@forward 'rtl';