Metacat

add section about importing self-signed certificates into the Java keystore (now that we use strict verification on the java client side when calling replication endpoints).

a few additional notes about Metacat replication configuration.

It looks like jk.conf and workers.properties were moved in the scripts dir: update the install docs accordingly.

Fixed a minor typo in the tomcat config section.

add note about https://redmine.dataone.org/issues/2451 to the documentation

update docs to match node registration behavior: we do not assign them nodeIds at registration

Set mime type on images.

Set mime type.

Use 'a2dissite' to disable the default site (not 'a2ensite').

Updated configuration documentation in admin guide for Metacat DataONE section. Changed links in configuration utility to point at the Admin guide.