Summary information by default on the attestations tab

[rolfyone]

The attestations tab is a lot of data, and I'm not sure how much of it we care deeply about by default.

I think by default, we could hide the aggregation bits field and the list of keys, and just have a count of the attesters that were signatories of a specific attestation in the summary.

So we have currently:

---

Attestation 0

Slot: 1234

Committee Index: 1, 2, 3...

Aggregation Bits

0000 1111 0000

Included Validators

abc, badbeef

---

Could be something like

Attestation 0

Slot: 1234

Committee Index: 1, 2, 3...

Votes Included: 1234

Aggregation bits ^

(click to fold down, could lazy load)

Validators ^

(click to fold down, could lazy load)

---

This should allow quicker browsing of the rough idea of what's in the blocks - and if people want to know they'd be able to open up that information

If this is too random, i can probably mock up the data - hopefully this makes sense though...