Remove link to the deprecated search.apache.org, change the embedded search...

Remove link to the deprecated search.apache.org, change the embedded search form to point to Google (copied from the 2.2 documentation).  Unfortunately my editor can't copy UTF-8 バージョン into a iso-2022-jp document, so I changed the resulting garbage to 'Apache' which I hope will do the trick.  If not, I am open to suggestions.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@939544 13f79535-47bb-0310-9956-ffa450edef68