feat: add edit post feature in blog posts (#384)

* feat: add edit post feature

* fix: remove edit button except on post detail pages

* docs: update site config docs for editPost

Resolves #191
---------

Co-authored-by: satnaing <satnaingdev@gmail.com>

src/layouts/PostDetails.astro

@@ -25,6 +25,7 @@ const {
   pubDatetime,
   modDatetime,
   tags,
+  editPost,
 } = post.data;
 
 const { Content } = await post.render();
@@ -82,6 +83,8 @@ const nextPost =
       modDatetime={modDatetime}
       size="lg"
       className="my-2"
+      editPost={editPost}
+      postId={post.id}
     />
     <article id="article" class="prose mx-auto mt-8 max-w-3xl">
       <Content />