Link in README.md to documentation of REST API is broken.

**Describe the bug**
The link to the documentation is broken.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'README.md.'
2. Click on 'https://kit-data-manager.github.io/webpage/metastore/documentation/REST/index.html'
3. See error

**Expected behavior**
Link should point to the newest API (APIv2).

**Screenshots**
