add Rewrite rule for /ptro to serve HTML content

Author: Said Fathalla

ptro/.htaccess

@@ -19,6 +19,14 @@ RewriteCond %{HTTP_ACCEPT} application/xhtml\+xml [OR]
 RewriteCond %{HTTP_USER_AGENT} ^Mozilla/.*
 RewriteRule ^(DKFZ[0-9]+)$ https://dkfz-e220.github.io/PTRO/doc/index-en.html#$1  [R=303,NE,L]
 
+# Rewrite rule for /ptro to serve HTML content
+RewriteCond %{HTTP_ACCEPT} !application/rdf\+xml.*(text/html|application/xhtml\+xml)
+RewriteCond %{HTTP_ACCEPT} text/html [OR]
+RewriteCond %{HTTP_ACCEPT} application/xhtml\+xml [OR]
+RewriteCond %{HTTP_USER_AGENT} ^Mozilla/.*
+RewriteRule ^/?$ https://dkfz-e220.github.io/PTRO/doc/index-en.html#$1  [R=303,NE,L]
+
+
 # Rewrite rule to serve RDF/XML content
 RewriteCond %{HTTP_ACCEPT} \*/\* [OR]
 RewriteCond %{HTTP_ACCEPT} application/rdf\+xml