Add redirect from https://in-toto.io/Attestation/v0.1 to the spec

[SurferJeffAtGoogle]

Linked from https://github.com/in-toto/attestation/blob/main/spec/predicates/provenance.md

[MarkLodato]

@SantiagoTorres is it possible to set up the in-toto.io website to redirect the type aliases to the canonical definitions?

[SantiagoTorres]

Hmm, I wonder if we could instead make a template to render markdown of the spec for each attestation...

[SantiagoTorres]

Let me dig into this tonight and propose a way fw...

[MarkLodato]

For reference, we defined https://slsa.dev/provenance to redirect to https://slsa.dev/provenance/v0.1, which is where we serve the docs via GitHub pages.

For the in-toto Attestation spec, you could either do the same or just redirect to GitHub.

[adityasaky]

Closing this as in-toto/in-toto.io#12 added redirects to this repo. Tracking rendering on website directly at in-toto/in-toto.io#16.