Fix the URLs of the GitHub repository.

Author: fukamachi

index.html

@@ -18,7 +18,7 @@ <h1><a href="./">CL21</a></h1>
       <ul>
         <!--<li><a href="./docs/">Documents</a></li>-->
         <li><a href="#installation">Installation</a></li>
-        <li><a href="https://github.com/fukamachi/cl21">The Project</a></li>
+        <li><a href="https://github.com/cl21/cl21">The Project</a></li>
       </ul>
     </nav>
   </header>
@@ -182,7 +182,7 @@ <h2>Motivation</h2>
         <h2>Discuss about this</h2>
 
         <p>Have some ideas which make CL21 look good? Do you know more efficient way to implement those facilities?</p>
-        <p>Comments are always welcome. Join discussion at <a href="http://www.reddit.com/r/lisp/comments/1xkx6u/a_set_of_macros_promising_to_modernize_common/" target="_blank">reddit</a> or <a href="https://github.com/fukamachi/cl21/issues" target="_blank">GitHub Issues</a>.
+        <p>Comments are always welcome. Join discussion at <a href="http://www.reddit.com/r/lisp/comments/1xkx6u/a_set_of_macros_promising_to_modernize_common/" target="_blank">reddit</a> or <a href="https://github.com/cl21/cl21/issues" target="_blank">GitHub Issues</a>.
       </section>
 
       <section id="requirements">