ETH/3Crv-focused Curve supply metrics

[micahalcorn]

Because OETH and OUSD are able to regulate their respective Curve token supplies via AMOs, it doesn't do us much good to track them as a success metric. As long as the peg for each token is properly maintained, the supply should always be approximately the same as ETH or 3Crv. The AMOs also mean that we should never have to worry about having sufficient liquidity for users to be able to purchase the tokens. What matters is how deep the liquidity is for the other side of the pair. Users want to know that if they acquire OETH, they can swap it in Curve for ETH without much price impact.

After all that typing, I realize we've already made this change for OETH in the analytics report email but not for OUSD. We should also update the label to make it clearer.

Current

Preferred (example)

	w/e 25 Jun	w/e 02 Jul
Curve ETH liquidity	7,322	9,226
Curve DAI+USDC+USDT liquidity	644,779	822,519