change test files that do not end in .txt to view via GitHub

2013/endoh1/.entry.json

@@ -62,7 +62,7 @@
 	    "inventory_order" : 150,
 	    "OK_to_edit" : true,
 	    "display_as" : "text",
-	    "display_via_github" : false,
+	    "display_via_github" : true,
 	    "entry_text" : "ed script"
 	},
 	{

2013/endoh1/index.html

@@ -300,7 +300,7 @@ solver</a>.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/endoh1/try.sh">try.sh</a> - how to run</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/endoh1/echo.lazy">echo.lazy</a> - lazy input</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/endoh1/hello.lazy">hello.lazy</a> - lazy input</li>
-<li><a href="rot13.ed">rot13.ed</a> - ed script</li>
+<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/endoh1/rot13.ed">rot13.ed</a> - ed script</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/endoh1/tac.lazy">tac.lazy</a> - lazy input</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>