integrations: Remove Phabricator integration.

Phabricator has not been actively maintained since June 2021.

docs/overview/architecture-overview.md

@@ -22,7 +22,6 @@ other glue code: [Python API
 bindings](https://github.com/zulip/python-zulip-api); [JavaScript API
 bindings](https://github.com/zulip/zulip-js); a [Hubot
 adapter](https://github.com/zulip/hubot-zulip); integrations with
-[Phabricator](https://github.com/zulip/phabricator-to-zulip),
 [Jenkins](https://github.com/zulip/zulip-jenkins-plugin),
 [Puppet](https://github.com/matthewbarr/puppet-zulip),
 [Redmine](https://github.com/zulip/zulip-redmine-plugin), and

static/images/integrations/logos/phabricator.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" height="120" width="120" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="-147 -147 294 294"><g id="d"><g id="c"><g id="b"><path id="a" d="M7.2-47 6-68H-6l-1.236 21"/><use xlink:href="#a" transform="scale(1 -1)"/></g><use xlink:href="#b" transform="rotate(90)"/></g><use xlink:href="#c" transform="rotate(45)"/></g><use xlink:href="#d" transform="rotate(22.5)"/><circle r="23"/><g fill="none" stroke="#000"><path stroke-width="14" d="M0 87c-66 0-117-54-138.5-87C-117-33-66-87 0-87S117-33 138.5 0C117 33 66 87 0 87z"/><circle r="47.5" stroke-width="19"/></g></svg>

templates/zerver/integrations/phabricator.md

@@ -1,6 +0,0 @@
-Zulip supports integration with Phabricator and can notify you
-of the latest items in your Phabricator feed.
-
-1.  Follow the instructions
-    [here](https://github.com/zulip/phabricator-to-zulip)
-    to get it set up.

zerver/lib/integrations.py

@@ -606,7 +606,6 @@ INTEGRATIONS: dict[str, Integration] = {
     "mastodon": Integration("mastodon", ["communication"]),
     "notion": Integration("notion", ["productivity"]),
     "onyx": Integration("onyx", ["productivity"], logo="images/integrations/logos/onyx.png"),
-    "phabricator": Integration("phabricator", ["version-control"]),
     "puppet": Integration("puppet", ["deployment"]),
     "redmine": Integration("redmine", ["project-management"]),
     "zoom": Integration("zoom", ["communication"]),