Replace all encoded protected headers with better examples

[OR13]

For example:

<<{
/ alg / 1: -7, / ES256 /
/ VDS / 395: 1,  / SHA-256 Binary Merkle Tree /
/ CWT Claims / 15: { 
  / issuer   / 1: "https://iss.example", 
  / subject / 2: "https://sub.example" 
}}>>

[henkbirkholz]

Just checking back on this one: why all of them? What benefit do we gleam from adding such noise?

[henkbirkholz]

We could do ellipses like h'dead…beef', paint proper EDN, and expand occasionally?