style: use Dark+ syntax theme

scripts/generate-post-index.js

@@ -13,7 +13,7 @@ const renderer = {
 }
 
 const highlighter = await createHighlighter({
-	themes: ["github-dark-dimmed"],
+	themes: ["dark-plus"],
 	langs: [
 		"javascript",
 		"typescript",
@@ -47,7 +47,7 @@ const posts = files.map((file) => {
 		(match, lang, code) => {
 			return highlighter.codeToHtml(code.trim(), {
 				lang: lang || "text",
-				theme: "github-dark-dimmed",
+				theme: "dark-plus",
 				transformers: [transformerColorizedBrackets()],
 			})
 		}