Rename develop -> development, contribute -> contributing, administer -> administration (#23662)

backport #23629 

To make versioned documentation less surprising, 1.19 should have the
same technology.

docs/content/doc/contributing.en-us.md

@@ -0,0 +1,13 @@
+---
+date: "2021-01-22T00:00:00+02:00"
+title: "Contributing"
+slug: "contributing"
+weight: 35
+toc: false
+draft: false
+menu:
+  sidebar:
+    name: "Contributing"
+    weight: 50
+    identifier: "contributing"
+---