style(layout): 优化全站板块标签与主标题的块级居中排版

public/assets/addons/official/css/modern_nhc.css

@@ -119,10 +119,11 @@ img {
 }
 
 .nhc-section-tag {
-  display: inline-flex;
+  display: flex;
+  justify-content: center;
   align-items: center;
   gap: 8px;
-  margin-bottom: 12px;
+  margin-bottom: 14px;
 }
 
 .nhc-section-tag .nhc-tag-text {
@@ -141,7 +142,7 @@ img {
   letter-spacing: 1px;
   margin-bottom: 16px;
   position: relative;
-  display: inline-block;
+  display: block;
 }
 
 .nhc-section-desc {