✨ feat: add github repository card extension feature

- remove astro-compress to improve build speed
- add target and rel attributes to footer links
- rename unocss opacity utility from 'opacity' to 'op'
- update PostList component's page logic from 'isTag' to 'isHome'
- create extend.css file for markdown extended features
- reorganize and sort styles in heti.css
- fix inline code wrapping issue

src/components/Widgets/BackToTop.astro

@@ -36,10 +36,10 @@ function initBackToTop() {
   observer = new IntersectionObserver(
     ([entry]) => {
       if (entry.isIntersecting) {
-        backToTopButton?.classList.add('opacity-0', 'pointer-events-none', 'translate-y-4')
+        backToTopButton?.classList.add('op-0', 'pointer-events-none', 'translate-y-4')
       }
       else {
-        backToTopButton?.classList.remove('opacity-0', 'pointer-events-none', 'translate-y-4')
+        backToTopButton?.classList.remove('op-0', 'pointer-events-none', 'translate-y-4')
       }
     },
     {