feat: Add job status to README

Author: macinsight

.github/README.md

@@ -2,3 +2,5 @@
 
 This repository serves as the backend for the DeepNet wiki, related to the game [DeepNet](https://deepnet.us).
 It serves the [associated GitHub Pages site](https://macinsight.github.io/deepwiki) using Material for MkDocs, with the `main` branch serving as source-of-truth.
+
+[![Page build](https://github.com/macinsight/deepwiki/actions/workflows/pages/pages-build-deployment/badge.svg?branch=main)](https://github.com/macinsight/deepwiki/actions/workflows/pages/pages-build-deployment)