Update readme with archive notice

Author: berrli

README.md

@@ -1,5 +1,9 @@
 <a rel="license" href=""><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a>
 
+# Repository Archived and Outdated
+
+This repository is no longer maintained and has been succeeded by the new [CfRR website](https://coding-for-reproducible-research.github.io/CfRR_Courses/programme_information/regression_analysis_with_r.html). All relevant content has been migrated, and the original URL now redirects to the updated site. 
+
 # Coding for Reproducible Research Workshop Template
 
 This repository is the template for creating websites for workshops that are part of the Coding for Reproducible Research intiative at UoE.