* add multi-server attributes to ldif
* add example compose file for a multiserver
* add readme
* add script for database creation within the existing database instance
* add generation of admin.pem
* add own certificate for kopano_server_2
* add admin.pem to compose (only for multiserver)
* add spooler for 2nd node
* add link to ldap demo readme
* split up ldap demo data for multi tenant setups
* replace pictures with new ones from https://www.pexels.com/search/people/ (free license without the need for attribution)
