update README (#29)

Removed mention of PCC CLI installation instructions.

Author: rkunjappan

README.md

@@ -8,7 +8,6 @@ Refer the [documentation](https://pcc.pantheon.io/pantheon-content-publisher-for
 -  A Google Workspace Account
 -  Drupal 10+ site with PHP 8.2+
 -  For sites hosted on Pantheon, enable [Pantheon Search](https://docs.pantheon.io/solr) and configure the search version in your `pantheon.yml`. Follow the instructions [here](https://docs.pantheon.io/guides/solr-drupal/solr-drupal#enable-at-the-site-level)
--  PCC CLI (Pantheon Content Publisher Command Line Tool). Instructions to install the CLI are [available here](https://pcc.pantheon.io/pcc-cli-setup).
 
 ## Installation