Added RSS and JSON feeds

sql/queries/posts.sql

@@ -1,12 +1,12 @@
 -- name: SelectPostsOfSite :many
 SELECT *
 FROM posts
-WHERE site_id = ? AND (
+WHERE site_id = sqlc.arg(site_id) AND (
     CASE CAST (sqlc.arg(post_filter) AS TEXT)
         WHEN 'deleted' THEN deleted_at > 0
         ELSE deleted_at = 0
     END
-) ORDER BY created_at DESC LIMIT 10;
+) ORDER BY created_at DESC LIMIT sqlc.arg(limit) OFFSET sqlc.arg(offset);
 
 -- name: SelectPost :one
 SELECT * FROM posts WHERE id = ? LIMIT 1;