Adjust hosting configuration to match new setup

Adjusts the publishing '.asf.yaml' configuration to use 'content/jdo' as
the subdir.

Adds '.htaccess', setting up URL forwarding from 'db.apache.org/jdo/*'
to 'db.apache.org/content/jdo/*'. This was done to act as if the website
were hosted under 'jdo' directly.
diff --git a/.asf.yaml.publish b/.asf.yaml.publish
index b08720c..f72b21b 100644
--- a/.asf.yaml.publish
+++ b/.asf.yaml.publish
@@ -3,4 +3,4 @@
 # This file is only used on the site publishing branch
 publish:
   whoami:  publish
-  subdir:  jdo
+  subdir:  content/jdo
diff --git a/.htaccess b/.htaccess
new file mode 100644
index 0000000..ebd3035
--- /dev/null
+++ b/.htaccess
@@ -0,0 +1,3 @@
+RewriteEngine On
+RewriteBase /jdo/
+RewriteRule ^(?!content/)(.*)$ content/$1