Update OpenLane 2 + Readme

README.md

@@ -1,11 +1,9 @@
 <h1 align="center">OpenLane</h1>
 <p align="center">
-    <a href="https://colab.research.google.com/github/chipsalliance/silicon-notebooks/blob/main/digital-inverter-openlane.ipynb"><img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open in Colab"></a>
     <a href="https://opensource.org/licenses/Apache-2.0"><img src="https://img.shields.io/badge/License-Apache%202.0-blue.svg" alt="License: Apache 2.0"/></a>
-    <img src="https://github.com/efabless/volare/actions/workflows/ci.yml/badge.svg?branch=main" alt="GitHub Actions Status Badge" />
     <a href="https://openlane.readthedocs.io/"><img src="https://readthedocs.org/projects/openlane/badge/?version=latest" alt="Documentation Build Status Badge"/></a>
-    <a href="https://invite.skywater.tools"><img src="https://img.shields.io/badge/Community-Open%20Source%20Silicon%20Slack-ff69b4?logo=slack" alt="Invite to the Open Source Silicon Slack"/></a>
-    <a href="https://github.com/psf/black"><img src="https://img.shields.io/badge/python%20code%20style-black-000000.svg" alt="Python Code Style: black"/></a>
+    <a href="https://open-source-silicon.dev"><img src="https://img.shields.io/badge/Community-Open%20Source%20Silicon%20Slack-ff69b4?logo=slack" alt="Invite to the Open Source Silicon Slack"/></a>
+    <a href="https://nixos.org/"><img src="https://img.shields.io/static/v1?logo=nixos&logoColor=white&label=&message=Built%20with%20Nix&color=41439a" alt="Built with Nix"/></a>
 </p>
 
 OpenLane is an automated RTL to GDSII flow based on several components including OpenROAD, Yosys, Magic, Netgen, CVC, SPEF-Extractor, KLayout and a number of custom scripts for design exploration and optimization. The flow performs all ASIC implementation steps from RTL all the way down to GDSII.