[DOC] minor improvements to README: white background for logo, link table formatting

README.md

@@ -16,18 +16,9 @@ package alongside direct interfaces to Optuna and scikit-learn optimizers, suppo
 
 ---
 
-<div align="center"><a name="menu"></a>
-  <h3>
-    <a href="https://github.com/SimonBlanke/Hyperactive#overview">Overview</a> •
-    <a href="https://github.com/SimonBlanke/Hyperactive#installation">Installation</a> •
-    <a href="https://nbviewer.org/github/SimonBlanke/hyperactive-tutorial/blob/main/notebooks/hyperactive_tutorial.ipynb">Tutorial</a> •
-    <a href="https://github.com/SimonBlanke/Hyperactive#citing-hyperactive">Citation</a> •
-    <a href="https://github.com/SimonBlanke/Hyperactive#license">License</a>
-  </h3>
-</div>
-
-| **Open&#160;Source** | [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![GC.OS Sponsored](https://img.shields.io/badge/GC.OS-Sponsored%20Project-orange.svg?style=flat&colorA=0eac92&colorB=2077b4)](https://gc-os-ai.github.io/) |
+| | [Overview](https://github.com/SimonBlanke/Hyperactive#overview) • [Installation](https://github.com/SimonBlanke/Hyperactive#installation) • [Tutorial](https://nbviewer.org/github/SimonBlanke/hyperactive-tutorial/blob/main/notebooks/hyperactive_tutorial.ipynb) • [API reference](https://simonblanke.github.io/hyperactive-documentation/) • [Citation](https://github.com/SimonBlanke/Hyperactive#citing-hyperactive) |
 |---|---|
+| **Open&#160;Source** | [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![GC.OS Sponsored](https://img.shields.io/badge/GC.OS-Sponsored%20Project-orange.svg?style=flat&colorA=0eac92&colorB=2077b4)](https://gc-os-ai.github.io/) |
 | **Community** | [![Discord](https://img.shields.io/static/v1?logo=discord&label=Discord&message=chat&color=lightgreen)](https://discord.gg/7uKdHfdcJG) [![LinkedIn](https://img.shields.io/static/v1?logo=linkedin&label=LinkedIn&message=news&color=lightblue)](https://www.linkedin.com/company/german-center-for-open-source-ai)  |
 | **CI/CD** | [![github-actions](https://img.shields.io/github/actions/workflow/status/SimonBlanke/hyperactive/test.yml?logo=github)](https://github.com/SimonBlanke/hyperactive/actions/workflows/test.yml) [![readthedocs](https://img.shields.io/readthedocs/hyperactive?logo=readthedocs)](https://www.hyperactive.net/en/latest/?badge=latest)
 | **Code** |  [![!pypi](https://img.shields.io/pypi/v/hyperactive?color=orange)](https://pypi.org/project/hyperactive/) [![!python-versions](https://img.shields.io/pypi/pyversions/hyperactive)](https://www.python.org/) [![!black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)  |