Show deeply nested yarn responses in Yarn page

[mattyg]

Currently the Yarn page only shows responses to that original Mew (i.e. 1 level of depth).

It might be nice if you could not only view those responses, but also the responses to those responses (i.e. > 1 level of depth), all from the same page.

We'll want to think about constraints to the UX (i.e. max levels of depth displayed by default), aiming to avoid a very large unconstrained dht query to fetch all the responses to a very active yarn.

[bierlingm]

Sounds like the easiest version of this is just adding a "see more" part underneath each Mew that then loads additional information into the same page. Perhaps it could be accompanied by (or implemented as) an "open up" and "close down" piece of UI like so: