Enhance www demonstration in mithril-client-wasm

[jpraynaud]

Why

The Cardano transaction verification part is not very easy to understand (https://github.com/input-output-hk/mithril/blob/main/mithril-client-wasm/www/index.js#L76)

What

This part of the demonstration should take a list of transactions (with e.g. 2 valid and 1 invalid) and the final result should be listing the valid transactions on one hand and the invalid on the other hand.

How

• Validate multiple transactions and discriminate valid/invalid in the result