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

2004/gavin/.entry.json

@@ -54,7 +54,7 @@
 	    "inventory_order" : 100,
 	    "OK_to_edit" : true,
 	    "display_as" : "text",
-	    "display_via_github" : false,
+	    "display_via_github" : true,
 	    "entry_text" : "boot loader configuration"
 	},
 	{

2004/gavin/index.html

@@ -286,7 +286,7 @@ at which a Linux bootloader loads an x86 kernel image).</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.alt.c">gavin.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.orig.c">gavin.orig.c</a> - original source</li>
 <li><a href="gavin.html">gavin.html</a> - author usage guide</li>
-<li><a href="lilo.conf">lilo.conf</a> - boot loader configuration</li>
+<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/lilo.conf">lilo.conf</a> - boot loader configuration</li>
 <li><a href="boot.b">boot.b</a> - boot sector</li>
 <li><a href="img/fs.tar">img/fs.tar</a> - tar of root file system</li>
 <li><a href="img/kernel">img/kernel</a> - Linux kernel x86 boot executable zImage</li>