chore: merge vant-doc to vant-cli

packages/vant-cli/site/common/style/base.less

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+@import './variable';
+
+body {
+  min-width: 1100px;
+  margin: 0;
+  overflow-x: auto;
+  color: #333;
+  font-size: 16px;
+  font-family: PingFang SC, 'Helvetica Neue', Arial, sans-serif;
+  background-color: #f0f3f6;
+  -webkit-font-smoothing: antialiased;
+}
+
+p {
+  margin: 0;
+}
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin: 0;
+  font-size: inherit;
+}
+
+ul,
+ol {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+a {
+  text-decoration: none;
+}
+
+.van-doc-row {
+  width: 100%;
+
+  @media (min-width: @van-doc-row-max-width) {
+    width: @van-doc-row-max-width;
+    margin: 0 auto;
+  }
+}

packages/vant-cli/site/common/style/highlight.less

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+@import './variable';
+
+code {
+  position: relative;
+  display: block;
+  margin-top: 20px;
+  overflow-x: auto;
+  color: @van-doc-code-color;
+  font-weight: 400;
+  font-size: 13px;
+  font-family: @van-doc-code-font-family;
+  line-height: 24px;
+  white-space: pre-wrap;
+  word-wrap: break-word;
+}
+
+pre {
+  margin: 0;
+}
+
+.hljs {
+  display: block;
+  padding: 0.5em;
+  overflow-x: auto;
+  background: #fff;
+}
+
+.hljs-subst {
+  color: @van-doc-code-color;
+}
+
+.hljs-string,
+.hljs-meta,
+.hljs-symbol,
+.hljs-template-tag,
+.hljs-template-variable,
+.hljs-addition {
+  color: @van-doc-purple;
+}
+
+.hljs-comment,
+.hljs-quote {
+  color: #999;
+}
+
+.hljs-number,
+.hljs-regexp,
+.hljs-literal,
+.hljs-bullet,
+.hljs-link {
+  color: #07c160;
+}
+
+.hljs-deletion,
+.hljs-variable {
+  color: #88f;
+}
+
+.hljs-attr,
+.hljs-keyword,
+.hljs-selector-tag,
+.hljs-title,
+.hljs-section,
+.hljs-built_in,
+.hljs-doctag,
+.hljs-type,
+.hljs-name,
+.hljs-selector-id,
+.hljs-selector-class,
+.hljs-strong {
+  color: @van-doc-blue;
+}
+
+.hljs-emphasis {
+  font-style: italic;
+}
+
+.hljs-attribute {
+  color: #e6550d;
+}

packages/vant-cli/site/common/style/index.less

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+@import './variable';
+@import './base';
+@import './highlight';

packages/vant-cli/site/common/style/variable.less

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+@van-doc-black: #323233;
+@van-doc-blue: #1989fa;
+@van-doc-purple: #5758bb;
+@van-doc-fuchsia: #a7419e;
+@van-doc-text-color: #34495e;
+@van-doc-text-light-blue: rgba(69, 90, 100, .6);
+@van-doc-grey: #999;
+@van-doc-dark-grey: #666;
+@van-doc-light-grey: #ccc;
+@van-doc-border-color: #f1f4f8;
+@van-doc-code-color: #455a64;
+@van-doc-code-background-color: #f1f4f8;
+@van-doc-code-font-family: 'Source Code Pro', 'Monaco', 'Inconsolata', monospace;
+@van-doc-padding: 30px;
+@van-doc-row-max-width: 1680px;
+@van-doc-nav-width: 220px;
+
+// header
+@van-doc-header-top-height: 60px;
+@van-doc-header-bottom-height: 50px;
+
+// simulator
+@van-doc-simulator-width: 360px;
+@van-doc-simulator-small-width: 320px;
+@van-doc-simulator-height: 620px;
+@van-doc-simulator-small-height: 560px;