fix: 修復上個版本導致的代碼塊部分css沒有生成的bugs

fix: 修復valine背景圖片再次出現時，由左到右移動的bugs
improvement: 調大sidebar的寬度
improvement: html結構調整，mobile-sidebar改為sidebar/search調整
remove: 刪除多餘的css和pug

source/css/_layout/sidebar.styl

@@ -0,0 +1,97 @@
+#sidebar
+  #menu-mask
+    position: fixed
+    z-index: 102
+    display: none
+    width: 100%
+    height: 100%
+    background: alpha($dark-black, .8)
+
+  #sidebar-menus
+    position: fixed
+    top: 0
+    right: -($sidebar-width)
+    z-index: 103
+    overflow-x: hidden
+    overflow-y: auto
+    width: $sidebar-width
+    height: 100%
+    background: var(--sidebar-bg)
+    transition: all .5s
+
+    &.open
+      transform: translate3d(-100%, 0, 0)
+
+    & > .author-avatar
+      padding: 1.3rem 1.5rem 0
+      text-align: center
+
+      img
+        width: 110px
+        height: 110px
+        border-radius: 70px
+        transition: all .5s
+
+        &:hover
+          transform: rotate(360deg)
+
+    .site-data
+      display: table
+      padding: .6rem .5rem 0
+      width: 100%
+      table-layout: fixed
+
+      .data-item
+        display: table-cell
+
+        .data-item-link
+          & > a > div
+            @extend .limit-one-line
+
+          .length-num
+            color: var(--text-highlight-color)
+            font-size: 1.28em
+
+          .headline
+            color: var(--font-color)
+
+    hr
+      margin: 1rem auto
+
+    .menus_items
+      padding: 0 .5rem 2rem
+
+      .site-page
+        @extend .limit-one-line
+        position: relative
+        display: block
+        padding: .3rem 1.5rem
+        color: var(--font-color)
+        font-size: 1.15em
+        cursor: pointer
+
+        i:first-child
+          width: 25%
+          text-align: left
+
+        span
+          width: 75%
+
+          &:hover
+            color: $light-blue
+
+      .expand
+        position: absolute
+        top: .78em
+        right: .4rem
+        transition: transform .3s
+
+        &.hide
+          transform: rotate(90deg) !important
+
+      .menus_item_child
+        margin: 0
+        list-style: none
+
+        if hexo-config('hide_sidebar_menu_child')
+          display: none