Add mapping for a2a repos. (#9)

Author: billnapier

404.html

@@ -104,6 +104,8 @@ <h1>404</h1>
           'google-oauth-java-client':   'googleapis',
           'oauth2client':               'googleapis',
           'iree':                       'openxla',
+          'a2a-python':                 'google-a2a',
+          'A2A':                        'google-a2a',
         };
 
         var repoRegex = new RegExp('^/([^/]+)(/|$)');