Collapsing and Expanding Forums

A quick feature update to help customize your forums index on chainBB.

The preferences are saved to your browser so the next time you visit the page it will remember your selections.

While we're in the beginning with very few forums, this should be a suitable solution for users who just want to be a part of specific forums. Eventually, when we have enough forums, I'm planning on letting you subscribe to forums, much like you can subscribe to subreddits.

$ 515.133 SBD