Prepare release candidate

[arnoweiss]

What's missing?

When the content is finished, we need

1. a commit that sets the specStatus config option to base and
2. sets the title of the spec to "Eclipse Decentralized Claims Protocol v1.0-RC1"
3. a tag v1.0-RC1 on the release commit
4. to change the redirect in .github/scripts/index.html to point to latest release candidate
5. (again) adjusted w3id referrals (currently going to resources/v1.0 but the deployment will be v1.0/resources
6. adjust the textual description of the context URI in the base spec
7. specifically put in the release date

and then another commit

1. a commit that sets the specStatus config option to base and
2. sets the title of the spec to "Eclipse Decentralized Claims Protocol v1.0-RC2"
3. remove the releasedate

Why should it be in the spec?

proper versioning

Where should this be added?

mentioned locations

More context

The referrals will stay broken until there's a tag 1.0 unless we change them with each release candidate.