Rename env var names

[mktcode]

NETWORK

snapshot-hub/src/graphql/helpers.ts

Lines 43 to 44 in fa64304

	const networkStr = network === 'testnet' ? 'demo.' : '';
	proposal.link = `https://${networkStr}snapshot.org/#/${proposal.space.id}/proposal/${proposal.id}`;

SNAPSHOT_URI:

snapshot-hub/src/events/index.ts

Line 51 in fa64304

deep_link: `${process.env.SNAPSHOT_URI}/#/${event.space}/${event.id}`

and now there's DEFAULT_NETWORK:

This is a bit confusing but NETWORK could actually be removed and replaced by SNAPSHOT_URI. It does nothing more than building the frontend URL for proposal links and/or push notifications.

Originally posted by @mktcode in #210 (comment)