docs: Use relative links for files outside the docs/ directory

Use javascript to fixup the "github pages" rendering of links to files
outside the docs/ directory.  Then use normal relative links in the
documentation.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/_layouts/default.html

@@ -118,5 +118,13 @@
     $('#toc').append(li);
   });
   </script>
+
+  <!-- Javascript to automatically fix links to files outside docs/ -->
+  <script>
+    $("a[href^='../']")
+      .each(function () {
+        this.href = $(this).attr("href").replace(/^\.\./, "https://github.com/KevinOConnor/klipper/blob/master");
+      });
+  </script>
 </body>
 </html>