Better display of Specberus errors

[marcoscaceres]

This is related to #3... or builds on it.

The current display of the error messages when Echidna can be a bit cryptic (specially when shown as json).

  Specberus Errors:
    Retrieved "previous" and "latest" documents, but their contents don't match.
      { name: 'headers.dl', section: 'front-matter', rule: 'docIDFormat' }

It would be nice to show the { ... } stuff in a more human friendly manner, and provide links to, for instance, "docIDFormat".

Also, we might want to replace the word "Specberus" for something more meaningful.

[sidvishnoi]

Relevant code if someone wants to take this on:

spec-prod/src/deploy-w3c-echidna.ts

Lines 177 to 189 in 453bce4

	specberus(errors) {
	console.group("Specberus Errors:");
	for (const error of errors) {
	const { detailMessage } = error;
	const { message, link } = error.extra || {};
	const { key, type } = error;
	console.group(detailMessage || message || key);
	if (type) console.log(type);
	if (link) console.log(link);
	console.groupEnd();
	}
	console.groupEnd();
	},

To mimic a run:

1. Return a valid ID (e.g, "15a512ae-12d6-4031-ae69-1f2a075a1f9c") from publish without actually publishing.
2. Run INPUTS_DEPLOY=true OUTPUTS_BUILD='{}' node src/deploy-w3c-echidna.js (assuming yarn dev is running in background)