settings_config: Add hardcoded data structure for playground-info mappings.
settings_config: Add hardcoded data structure for playground-info mappings.

This is being hardcoded just for the prototype, post which we should add
support for realm admins to configure their own choices. The structure
here is similar to what we eventually want in the configuration API.

rht/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,rht/zulip,zulip/zulip,andersk/zulip,rht/zulip,rht/zulip,zulip/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,showell/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,showell/zulip,zulip/zulip,kou/zulip,punchagan/zulip,showell/zulip,rht/zulip,hackerkid/zulip,showell/zulip,punchagan/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,kou/zulip,hackerkid/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,showell/zulip,andersk/zulip,showell/zulip,punchagan/zulip,kou/zulip,andersk/zulip,punchagan/zulip