Reorganize tree to better support multiple documents.

doc/guide/LDAPwww.gif

doc/guide/admin/config.sdf

doc/guide/admin/config_local.gif

doc/guide/admin/config_repl.gif

doc/guide/admin/config_x500fe.gif

doc/guide/admin/config_x500ref.gif

doc/guide/admin/dbtools.sdf

doc/guide/admin/install.sdf

doc/guide/admin/intro.sdf

doc/guide/admin/intro_tree.gif

doc/guide/admin/master.sdf

doc/guide/admin/monitoringslapd.sdf

doc/guide/admin/preamble.sdf

doc/guide/admin/quickstart.sdf

doc/guide/admin/referrals.sdf

doc/guide/admin/replication.gif

doc/guide/admin/replication.sdf

doc/guide/admin/runningslapd.sdf

doc/guide/admin/slapdconfig.sdf

doc/guide/admin/title.sdf