update copyright year

Author: ecwu

content/cn/_index.md

@@ -35,7 +35,7 @@ carouselSlides:
       - color: success
         content: 立即体验
         href: https://course.uichcc.app/
-      - color: info
+      - color: primary
         content: 了解更多
         href: /projects/uiccourse/
 

content/en/_index.md

@@ -34,7 +34,7 @@ carouselSlides:
       - color: success
         content: Try it now
         href: https://course.uichcc.app/
-      - color: info
+      - color: primary
         content: Learn More
         href: /projects/course/