Change the format slightly so that each "context" get's its own tag in

Change the format slightly so that each "context" get's its own tag in
a <contextlist>.  This should make it easier to, for example, generate
an index of all the directives available in a certain context.

Also, add a css stylesheet, turn off link underlining, and turn all the
directive and module names green.  Further refinement necessary for sure.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93427 13f79535-47bb-0310-9956-ffa450edef68