Complete installation instructions

[matthias-ronge]

The installation instructions lack the steps for setting up drive sharing (LDAP, Samba). The following main steps should be documented:

• [x] install LDAP
• [x] add “Samba schema” to LDAP
• [x] create basic LDAP content (root node, LDAP admin, a user group, a folder for users, at least one Kitodo user, NextFreeUnixID object)
• [x] install and configure authentication with libnss-ldap
• [x] install and configure Samba
• [x] configure “LDAP server” and “LDAP group”

[matthias-ronge]

The missing information is now available from an installation instructions (temporarily named version 2.3.1).