bug: giscus data-mapping url -> pathname 변경

Author: devwqc

src/components/PostComments.astro

@@ -10,7 +10,7 @@
   data-repo-id="R_kgDOM5MFPQ"
   data-category="Blog Posts Comments"
   data-category-id="DIC_kwDOM5MFPc4Ci-uX"
-  data-mapping="url"
+  data-mapping="pathname"
   data-strict="0"
   data-reactions-enabled="1"
   data-emit-metadata="0"