Replace TVL with TAF

[hieronx]

Once centrifuge/api#254 is merged and released by EMBRIO, the metric on the landing page should be updated from total value locked to total assets financed.

This metric can be computed by taking the sum of sumBorrowedAmount for all pools in the subquery.

[hieronx]

@kattylucy this is now unblocked, subquery has the required data.

[kattylucy]

Im trying to use this for apps but im getting 100.7M for the sumBorrowedAmount. Is this correct? is not the same as the website, Im guessing is missing the tinlake data @hieronx

[hieronx]

@kattylucy which subquery endpoint are you querying from? Should be api.centrifuge.io. Let me know if that also gives the same result.