guide: Port index to Markdown

Author: garrett

guide/index.html

@@ -0,0 +1,16 @@
+---
+title: Cockpit guide archives
+class: cockpit-guide
+---
+
+The Cockpit Guide is for those deploying Cockpit or developing parts of Cockpit.
+
+## Latest Cockpit Guide
+
+- [View the latest Cockpit Guide](./latest/)
+
+## Guide for specific older versions of Cockpit
+
+Specific, older versions of the guide:
+
+- [195](195/)