[PIP-3] Restructuring nDEFI and other Soft Synth changes

This proposal aims to improve the functionality and composability of nests on Polly Finance.

You can find the full details of the proposal here: https://gov.bao.finance/t/pip-3-restructuring-ndefi-and-other-soft-synth-changes/1039

A summary of the changes that will be implemented, if approved, are:

• Significantly simplify nDEFI to only include tokens with good liquidity on Polygon and have a chainlink feed already

• Take out the infrastructure components from nDEFI and create a separate nINFRA nest.

-Introduce new nest nPOLY, a polygon ecosystem nest.

-Create new nINFRA/ETH, nINFRA, nPOLY/ETH and nPOLY farms

-End all nDEFI underlying asset farms

-Clarify that multisig can change yield strategies on underlying tokens to any previously approved options for all nests.

-After the proposed nests, focus for soft synths on Polygon will shift towards opening up the platform to allow anyone to create nests with plug in rebalancing and yield strategies instead of creating them ourselves