Add ChoreWheel and Reinventing Organizations examples, trim whitespace

[kronosapiens]

Adds two examples to chapter 5.7 - "Social Markets"

• Adds the example of Chore Wheel in the section on community currencies and reputation systems.
• Adds the reference to Reinventing Organizations in the section on plural practices in the workplace.

Miscellaneous whitespace trimming.

Noting that the paper referenced in the Chore Wheel example will be published in the next issue of the Metagov journal of digital governance.

[GlenWeyl]

This is great stuff, no technical problems will let Gov4Git vote.

[pluralitybook-dao]

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