Remove ability to push to quay

Since pub is not yet ready to support this functionality, the commit
that adds this functionality will be added at a later date.

MANIFEST.in

@@ -3,4 +3,3 @@ include README.rst
 include LICENSE
 recursive-include docs *.rst conf.py Makefile
 recursive-include pubtools_iib *.py
-include requirements.txt

README.rst

@@ -30,7 +30,6 @@ Setup
 Usage
 =====
 
-Push the created index image to Pulp
 ::
 
   $ export PULP_PASSWORD="pulppassword"
@@ -42,7 +41,6 @@ Push the created index image to Pulp
     --index-image container-registry.example.com/index/image:latest
     --bundle container-registry.example.com/bundle/image:123
     --arch x86_64
-    --skip-quay
     --deprecation-list container-registry.example.com/index/bundle-image:latest,container-registry.example.com/index/bundle-image:2
 
   $ export PULP_PASSWORD="pulppassword"
@@ -54,30 +52,4 @@ Push the created index image to Pulp
     --index-image container-registry.example.com/index/image:latest
     --operator bundle/image:123
     --arch x86_64
-    --skip-quay
-
-Push the created index image to Quay in a remote server and send a UMB message
-::
-
-  $ export QUAY_PASSWORD=quay_password
-  $ export SSH_PASSWORD=ssh_password
-  $ pubtools-iib-add-bundles \
-    --iib-server iibhostname.example.com \
-    --binary-image container-registry.example.com/binary/image:latest \
-    --index-image container-registry.example.com/index/image:latest \
-    --bundle container-registry.example.com/bundle/image:123 \
-    --arch x86_64 \
-    --skip-pulp \
-    --quay-dest-repo quay.io/namespace/repo \
-    --quay-user namespace+robot_account \
-    --quay-remote-exec \
-    --quay-ssh-remote-host 127.0.0.1 \
-    --quay-ssh-remote-host-port 2222 \
-    --quay-ssh-username ssh_user \
-    --quay-send-umb-msg \
-    --quay-umb-url amqps://umb-url1:5671 \
-    --quay-umb-url amqps://umb-url2:5671 \
-    --quay-umb-cert /path/to/file.crt \
-    --quay-umb-client-key /path/to/file.key \
-    --quay-umb-ca-cert /path/to/cacert.crt