[FEATURE REQUEST] Discovery

Would be nice to have a  link under Activity for Discovery so we can explore other channels that want to be found. (Not sure if this is planned or already being discussed, but figured I'd ask)

Some thoughts:

• A channel has to specify they want to be discovered.
• Grouping each channel by preferred topic/game.
• Ability to promote our channel similar to Facebook/Twitter (possible additional revenue for Discord).
• Adding a quick blurb about the community.
• See channel rules before being able to join. A quick popup that let's the user know what is/isn't allowed in the channel.
• Highlighting events within a channel. Upcoming contests, challanges, esport events, etc.

Thanks!