refactor(scss): remove some unused style

assets/scss/partials/layout/article.scss

@@ -93,36 +93,6 @@
     }
 }
 
-#TableOfContents {
-    background: var(--card-background);
-    border-radius: var(--card-border-radius);
-    @include box_shadow(1);
-    ul {
-        padding: 0;
-        margin: 0;
-        list-style: none;
-
-        li {
-            padding: 15px 30px;
-            padding-right: 50px;
-            position: relative;
-
-            &:not(:last-of-type) {
-                border-bottom: 1px solid var(--card-separator-color);
-            }
-
-            a {
-                color: var(--accent-color);
-            }
-
-            ul {
-                border-top: 1px solid var(--card-separator-color);
-                margin-top: 15px;
-            }
-        }
-    }
-}
-
 #article-toolbar {
     background: var(--card-background);
     @include box_shadow(1);

assets/scss/partials/menu.scss

@@ -204,11 +204,3 @@
         }
     }
 }
-
-@media (max-width: $on-phone) {
-    .show-menu {
-        .site-info {
-            //@include box_shadow(2);
-        }
-    }
-}

assets/scss/partials/widgets.scss

@@ -38,24 +38,7 @@
     }
 }
 
-/* Tweet widget */
-.tweet-container {
-    .tweet--item {
-        .tweet--text {
-            font-size: 1.6rem;
-            color: var(--accent-color);
-            line-height: 1.75;
-        }
-
-        .tweet--time {
-            text-transform: uppercase;
-            a {
-                color: var(--body-text-color);
-            }
-        }
-    }
-}
-
+/* Archive widget */
 .widget.archive {
     .archive-year {
         margin-bottom: 10px;