kubectx: add page (#2616)

pages/common/kubectx.md

@@ -0,0 +1,19 @@
+# kubectx
+
+> Utility to manage and switch between `kubectl` contexts.
+
+- List the contexts:
+
+`kubectx`
+
+- Switch to a named context:
+
+`kubectx {{name}}`
+
+- Switch to the previous context:
+
+`kubectx -`
+
+- Delete a named context:
+
+`kubectx -d {{name}}`