Replace teams and goal instances with projects

[shereefb]

Context

Team + Goal instance = Project. Let's simplify.

Criteria

Get rid of "team formation" language, and "team" language, and start thinking of projects.

Principles razor

In order for an issue to be marked as passing, the proposed solution must be aligned with our principles. Check off the principles that this solution is consistent with.

• [x] Cultivate a learning community.
• [x] Prioritize scale over quality
• [x] Align incentives
• [x] Build a team game
• [x] Trust people's intentions and potential
• [ ] Enable self-organization & self-determination
• [ ] Map feedback loops
• [x] Optimize for agility
• [x] Simulation not preparation
• [ ] Sustain the tension between individual and collective gain

[tannerwelsh]

See PR #271

[tannerwelsh]

@shereefb ready for review. LMK if this meets what you were thinking of for projects.