chore: delete useless code

Author: cotes2020

_sass/addon/commons.scss

@@ -419,10 +419,6 @@ i { /* fontawesome icons */
   word-spacing: 1px;
 
   a {
-    &:not(:last-child) {
-      margin-right: 2px;
-    }
-
     &:not([class]):hover {
       @extend %link-hover;
     }
@@ -546,7 +542,6 @@ i { /* fontawesome icons */
 .img-link {
   color: transparent;
   display: inline-flex;
-  overflow: hidden;
 }
 
 .shimmer {

_sass/layout/post.scss

@@ -26,17 +26,9 @@
   color: var(--text-color);
 }
 
-%preview-margin {
-  margin: 0;
-}
-
 .preview-img {
-  @include align-center;
-  @extend %preview-margin;
   @extend %rounded;
 
-  max-width: 100%;
-
   &:not(.no-bg) {
     img.lazyloaded {
       background: var(--img-bg);
@@ -48,7 +40,6 @@
     -o-object-fit: cover;
     object-fit: cover;
 
-    @extend %preview-margin;
     @extend %rounded;
   }
 }