feat: add dark theme, matrix and FA link, fix inline SVG aria label

src/styles/global.css

@@ -7,6 +7,10 @@
 }
 
 @layer base {
+  body {
+    @apply bg-neutral-50 text-black dark:bg-neutral-800 dark:text-white;
+  }
+
   h1 {
     @apply text-5xl font-bold;
   }
@@ -16,4 +20,14 @@
   .link-mastodon {
     @apply bg-mastodon-dark hover:bg-mastodon-dark-hover text-white;
   }
+
+  .link-matrix {
+    @apply bg-black text-white hover:bg-zinc-950;
+  }
+}
+
+@layer utilities {
+  .text-soft {
+    @apply text-zinc-600 dark:text-zinc-400;
+  }
 }