Add user management for talks

[jhthorsen]

I think the missing part from eventbrite is talk management.

We need a user to be able to...

• View talks
• Edit talks
• Submit talks (change status from "new" to "submitted" or something)

Not sure about the meta info, but at least:

• Author
• Talk title
• Talk URL
• Talk abstract
• Talk duration

[jhthorsen]

See also #19.

[jhthorsen]

This is what ACT has:

• abstract
• accepted
• conf_id
• confirmed
• duration
• lightning
• room
• talk_id
• title
• track_id
• user_id

[jberger]

With #30 and #31 I think we can call this closed. Any additional features may be added later.

[jhthorsen]

:+1: