style(index.css, single_index.html, single_index.zh.html): 首页icon替换

public/themes/dist_static/static/css/index.css

@@ -168,7 +168,8 @@
 .section-1__icon [stroke] {
   stroke: currentColor;
 }
-.section-1__icon [fill]:not([fill=none]) {
+/* 白填充保留原色，hover/active 只改深色描边与填充 */
+.section-1__icon [fill]:not([fill=none]):not([fill="rgb(255,255,255)"]):not([fill="#fff"]):not([fill="#ffffff"]):not([fill="white"]) {
   fill: currentColor;
 }
 .section-1__item.is-active .section-1__icon, .section-1__item:hover .section-1__icon {