make the raw file directory a sitewide variable

Signed-off-by: Grace Grimwood <ggrimwoo@redhat.com>

Author: gracegrimwood

_data/kroxylicious.yml

@@ -1,3 +1,4 @@
 # The version number of the latest release
 latestRelease: 0.18.0
-
+# The sub-path at which the raw Javadoc files can be found.
+javadocRawSubdir: raw

_layouts/javadoc-wrapper.html

@@ -28,7 +28,7 @@
                     // Construct the new URL by removing the '.raw' part of the path
                     const currentUrl = new URL(window.location.href);
                     const newUrl = new URL(href, iframe.src);
-                    window.top.location.href = newUrl.href.replace('/raw/', '/');
+                    window.top.location.href = newUrl.href.replace('/{{ site.data.kroxylicious.javadocRawSubdir }}/', '/');
                 };
             }
         }