Update index.html

Author: j4docsearch

index.html

@@ -9,14 +9,14 @@
   <!-- Open Graph (SNS 및 미리보기용) -->
   <meta property="og:title" content="J4DocSearch – 문서 본문 검색기">
   <meta property="og:description" content="다양한 문서 포맷에서 키워드 검색이 가능한 고속 문서 검색기. PDF, HWPX, DOCX 등 지원.">
-  <meta property="og:image" content="https://yourusername.github.io/j4docsearch/screenshot.png">
-  <meta property="og:url" content="https://yourusername.github.io/j4docsearch">
+  <meta property="og:image" content="https://j4docsearch.github.io/j4docsearch/screenshot.png">
+  <meta property="og:url" content="https://j4docsearch.github.io/j4docsearch">
 
   <!-- Twitter Card -->
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="J4DocSearch – 문서 본문 검색기">
   <meta name="twitter:description" content="다양한 문서에서 본문 내용을 빠르게 검색할 수 있는 오픈소스 도구.">
-  <meta name="twitter:image" content="https://yourusername.github.io/j4docsearch/screenshot.png">
+  <meta name="twitter:image" content="https://j4docsearch.github.io/j4docsearch/screenshot.png">
 
   <style>
     body {