feat: Add internationalization (i18n) support (#182)

assets/styles/base.scss

@@ -10,11 +10,14 @@
 html {
   scroll-behavior: smooth;
   &:lang(ar) {
-    & p, & h1, & h2, & h3, article {
+    & p, & h1, & h2, & h3, article, header {
       direction: rtl;
       text-align: right;
     }
   }
+  & footer > p {
+    text-align: center !important;
+  }
 }
 
 .singlePage {