feat: add doc versioning

Signed-off-by: ankitm123 <ankitmohapatra123@gmail.com>

config.toml

@@ -186,3 +186,28 @@ no = 'Sorry to hear that. Please <a href="https://github.com/jenkins-x/jx-docs/i
 	url = "https://kubernetes.slack.com/messages/C9LTHT2BB"
 	icon = "fab fa-slack"
   desc = "Chat with other project developers"
+
+# Versioning
+[[params.versions]]
+version = "v2.0"
+ghbranchname = "release-v2"
+url = "/v2.0-docs/"
+dirpath = "v2.0-docs"
+
+[[params.versions]]
+version = "v3.0"
+ghbranchname = "release-v3"
+url = "/docs/v3"
+dirpath = "v3.0-docs"
+
+[[params.versions]]
+version = "Pre-release"
+ghbranchname = "master"
+url = "/docs/"
+dirpath = "docs"
+
+
+[[redirects]]
+from = "/v3/*"
+to = "/docs/:splat"
+status = 200