Consider indexing proposals based on on-chain proposal id rather than CGP document number

[m-chrzan]

Problem

It appears that currently the list of proposals displayed in the Governance tab is based on the CGP documents in the governance repo. This leads to a past on-chain vote getting lost when a proposal is resubmitted with the same referenced document.

As an example, see CGP-152. It was first put up for voting on November 2 with proposal ID 192, got rejected, then resubmitted on Novermber 29 with ID 195.

The links in the above paragraph are to celo.stake.id, which indexes proposals based on ID, creating a separate page for each on-chain proposal, keeping a history of all Governance activity. Mondo currently does not handle this, and the rejected proposal with ID 192 is nowhere to be found.

Solution

Index governance proposals based on on-chain ID rather than CGP document number. I understand this could be a bigger reworking, since it appears that on the backend, Mondo currently relies on CGP document numbering for listing out proposals, but I think it's an important change to display a full, transparent history of the Governance process on the site.