simplify asset management

[turadg]

What is the Problem Being Solved?

Each time we add an asset there are a bunch of files to update. e.g. #154

Description of the Design

Import the data so that adding an asset here could be simply a matter of adding it to a list.

https://www.npmjs.com/package/chain-registry is a candidate, but 2mb

another is Leap Elements

Security Considerations

Would add a dependency. Yarn lock ensures it doesn't update unexpectedly.

Test Plan