improve display_via_github and display_as values

Fixed some inconsistent use of display_via_github and display_as values.

2020/kurdyukov3/index.html

@@ -201,7 +201,7 @@ as these letters are encoded in the higher part of the single-byte character set
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/prog.alt.c">prog.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/prog.orig.c">prog.orig.c</a> - original source</li>
-<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/input.txt">input.txt</a> - sample input</li>
+<li><a href="input.txt">input.txt</a> - sample input</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/prog.extra.c">prog.extra.c</a> - alternative source with extra functionality</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov3/try.sh">try.sh</a> - how to run</li>
 </ul>