make more types of main viewers

[spencercap]

• asset (see current + past asset config)
• block (contains txns + grouped txns)
• transaction (w note decoded in various ways)

[spencercap]

/asset is becoming obvious. what would be displayed on the asset detail page that's not in the search area?

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https://irulan.dev/testnet?s=45528600
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https://irulan.dev/testnet/asset/45528600

[enceladus]

I had originally envisioned an asset control panel, where you could send, freeze, clawback, change manager address, whatever else is possible with it.

We should split this issue into multiple issues tho — an asset panel is the first task, the block explorer stuff is kind of a separate mission.