Make the deprecation note even _more_ obvious

Author: jeffwidman

README.md

@@ -1,6 +1,10 @@
+# This repo is deprecated!
+
 > [!CAUTION]
 > Using dependabot-script is no longer the preferred way to run a self-hosted version of Dependabot. See the [Example CLI Usage](https://github.com/dependabot/example-cli-usage) repo for how to use the [Dependabot CLI](https://github.com/dependabot/cli) instead for this purpose.
 
+----
+
 # Dependabot Script
 
 This repo is a collection of scripts to use as entrypoints to the [Dependabot Core][dependabot-core] library. It is intended as a starting point for advanced users to run a self-hosted version of Dependabot within their own projects.