make Team explorer sortable

[chadwhitacre]

Reticketed from #3704.

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[chadwhitacre]

Some sorts:

• oldest
• newest
• receiving the most
• receiving the least
• most givers
• fewest givers

As on #3704, use GitHub Issues sort UI as the exemplar.

[mattbk]

Once we sort, we'll need a default sort order. See levels discussed regarding Decouple:

Level 3: Open Payouts ← "open work" according to our current definition
Level 2: Transparent Payouts ← public payouts, but no self-onboarding
Level 1: Closed Payouts ← twyw, but private
Level 0: No Payouts ← no twyw; "team of one" or closed company or what have you.

[kaguillera]

Is this a sort order or a filter?

[mattbk]

Could be both, but would be useful as a sort order before anything else. So as a default, sort by level, then by most recent (within each level). The reason being that we're encouraging teams projects to "level up" and be more open by giving them better placement on the homepage. Sorts by the user would override this, e.g., clicking on "sort by age" would bump everyone into order without taking level into account.

So for some example projects:
Team A Level 3, most recent overall
Team B Level 3, third-most recent overall
Team C Level 3, fifth-most recent overall
Team D Level 2, second-most recent overall
Team E Level 1, fourth-most recent overall

[mattbk]

Our old leaderboard was a big part of MaxCDN's motivation for giving on Gratipay. I think we reach out to Justin again once we have something back along those lines.

(gratipay/inside.gratipay.com#757 (comment))

[JessaWitzel]

Does the Featured Tab count as a leaderboard or is that something else we want to implement?

[chadwhitacre]

It's a leaderboard of sorts for the receiver side, but #3736 (comment) is actually more along the lines of #2695.