[Govern] Supports off-chain governance link

[aggre]

The current governance list only supports on-chain governance.

However, off-chain governance using Discord and forums have also been held recently.

I think the fact that they are not listed in governance makes it a bit opaque to the community.

I think it would be nice if Govern lists supported more structures than just contract addresses, such as:

type OffChainGovernance = {
	title: string,
	url: string
}

export const proposals: Array<string | OffChainGovernance> = [
	{
		title: 'Proposal title',
		url: 'https://foo.bar...'
	},
	'0x94506b9ab0a7a34e03b481f26b123201b798ea89',
	'0xef2dc3AaADCE76CcC49299A4f7eB36606Dd95C97',
	'0x0664B71Ab485dda55f1DC895C9e858E50d5E5584',
	'0xB78c2F61501C858D6eeF78AFCe3f11a0a31DcEcC',
	'0x6c38f1556AeAC49ACFEAD034a08F4c2E7F255956',
]

https://github.com/dev-protocol/govern/blob/86a569a7209e45983f70cbbfd20bc0cc0288126e/src/constant/contracts.ts