Revert "Lock down development of installer (#13350)" (#14230)

* Revert "Lock down development of installer (#13350)"

This reverts commit a08b488.

* Fix owners and readme

install/OWNERS

@@ -1,5 +1,9 @@
-# No changes should be made here
-# Make all changes to istio-installer
 approvers:
   - costinm
   - sdake
+  - linsun
+  - rshriram
+  - howardjohn
+  - mandarjog
+  - morvencao
+  - ostromart

install/kubernetes/helm/README.md

@@ -4,6 +4,4 @@ Please follow the installation instructions from [istio.io](https://istio.io/doc
 
 # Development
 
-Istio installation is based upon a new decomposed installation technology in Istio 1.2.  As such, all development work should occur in [istio/installer](https://github.com/istio/installer).
-
-If you have work that you feel should be backported to resolve defects, please submit to this repository on the release-1.1 branch so it can be added to the 1.1.x stream.
+Future development for the installer is taking place on [istio/installer](https://github.com/istio/installer). Please add new features to this repository, as only bug fixes will be allowed here.