update README

Author: tschaume

README.md

@@ -4,5 +4,4 @@
 ![Swagger Validator](https://img.shields.io/swagger/valid/3.0?specUrl=https%3A%2F%2Fcontribs-api.materialsproject.org%2Fapispec.json&style=flat-square)
 ![GitHub](https://img.shields.io/github/license/materialsproject/MPContribs?style=flat-square)
 
-| [Documentation](https://docs.mpcontribs.org) | [Portal](https://contribs.materialsproject.org) | [API Client](https://pypi.org/project/mpcontribs-client/) |
-|-----|-----|-----|
+See https://mpcontribs.org