[Improvement] Allow self-distribution of Connect

[artursapek]

Today, the only official way of integrating Connect into an application requires it be downloaded from the unpkg.com CDN. This kind of centralization is bad for multiple reasons:

• unpkg.com infrastructure is a single point of failure
• everyone using Wormhole Connect is exposed to supply chain attacks on our NPM package. Such an attack happened to Ledger literally last week.

Given Connect's role as a wallet aggregator, it's especially attractive as an attack target. Developers should be able to host their own copies of Connect and not rely on the unpkg.com CDN.

Open questions:

• What is the ideal way to let people bundle Connect into their own applications?
• How do we deal with the fact that the current NPM package is published from wormhole-connect-loader, yet the actual source code lives inside wormhole-connect?

[aadam-10]

covered in #1715