README.md links to git.corp.adobe.com, which is accessible by Adobe employees only

### Expected Behaviour
Links that are used in [README.md](https://github.com/adobe/griffon-toolkit/blob/main/README.md) should be linked to publicly accessible pages.

### Actual Behaviour
Links in README.md are linking to git.corp.adobe.com, which is accessible by Adobe employees only.

Actual links:
- "root structure": https://git.corp.adobe.com/pages/dms-mobile/griffon-toolkit/root.html
- "Annotations": https://git.corp.adobe.com/pages/dms-mobile/griffon-toolkit/annotation.html

Open README.md and inspect the two links listed in the issue: “root structure” and “Annotations.” Identify publicly accessible replacements for the git.corp.adobe.com pages, update the links, and verify that both destinations work for users without Adobe access.

Written by the indexing model from the issue text.