Feat/config and multidb

[nikonikoniko]

This branch requires the addition of a file called custom.cfg.js which is in gitignore.

at the moment, mine looks like:

export const config = { "_type": "kid2_config",
                        "dbs": [
                          {"_type": "local_db_config",
                           "name": "local_db"},
                          {"_type": "server_db_config",
                           "name": "shared_db",
                           "location": "http://0.0.0.0:10102/" }
                        ]}