Display totalSupply and value of UNI tokens on Uniswap.info pairs

[nagolinc]

Balancer displays the totalSupply and approximate value of BPT tokens for each of the pairs. So far as I can tell, the corresponding information for UNI tokens is not displayed on Uniswap.info, and the only way to get it is to inspect the contract on Etherscan.

This information is useful because many yield farms only tell you how many UNI tokens you have deposited, not how much they are work (see for example https://eth.mirror.finance/ ). So figuring out how much value is locked in a yield farm cannot be easily done simply by looking at uniswap.info.