Docs: Add KeePass database 1->2 migration guide
Docs: Add KeePass database 1->2 migration guide

ehartsuyker/securedrop,micahflee/securedrop,micahflee/securedrop,garrettr/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,micahflee/securedrop,garrettr/securedrop,heartsucker/securedrop,conorsch/securedrop,conorsch/securedrop,heartsucker/securedrop,micahflee/securedrop,garrettr/securedrop,conorsch/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop