docs: add vitepress sidebar icons

Author: tangly1024

.vitepress/theme/style.css

@@ -1,5 +1,82 @@
 /* 文档站主题扩展 */
 
+.VPSidebar .VPSidebarItem.level-0 > .item > .text,
+.VPSidebar .VPSidebarItem.level-1.is-link .text {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.VPSidebar .VPSidebarItem.level-0 > .item > .text::before,
+.VPSidebar .VPSidebarItem.level-1.is-link .text::before {
+  display: inline-flex;
+  flex: 0 0 auto;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+  font-size: 15px;
+  line-height: 1;
+}
+
+.VPSidebar .VPSidebarItem.level-1.is-link .text::before {
+  content: '📄';
+  opacity: 0.72;
+  font-size: 13px;
+}
+
+.VPSidebar .group:nth-of-type(1) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🚀';
+}
+
+.VPSidebar .group:nth-of-type(2) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '📝';
+}
+
+.VPSidebar .group:nth-of-type(3) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '📚';
+}
+
+.VPSidebar .group:nth-of-type(4) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '☁️';
+}
+
+.VPSidebar .group:nth-of-type(5) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🧩';
+}
+
+.VPSidebar .group:nth-of-type(6) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '⚙️';
+}
+
+.VPSidebar .group:nth-of-type(7) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🎨';
+}
+
+.VPSidebar .group:nth-of-type(8) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '📊';
+}
+
+.VPSidebar .group:nth-of-type(9) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '💬';
+}
+
+.VPSidebar .group:nth-of-type(10) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🔌';
+}
+
+.VPSidebar .group:nth-of-type(11) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🛠️';
+}
+
+.VPSidebar .group:nth-of-type(12) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '📈';
+}
+
+.VPSidebar .group:nth-of-type(13) .VPSidebarItem.level-0 > .item > .text::before {
+  content: '🛟';
+}
+
 .VPSidebar a.nn-unread-leaf,
 .VPSidebarNav a.nn-unread-leaf,
 aside a.nn-unread-leaf,