Remove custom documentation of PhpStorm Gerrit plugin in appendix (#357)

Author: pixeldesu

Documentation/Appendix/IdePhpStormGerritPlugin.rst

@@ -132,14 +132,17 @@ Recommended Plugins
   This helps with code-completion and navigation in combination with unit tests
   and Prophecy (among other things).
 
+.. _phpstorm-gerritplugin:
+
 Optional Plugins
 ----------------
 
 * `Fluid plugin <https://plugins.jetbrains.com/plugin/11151-fluid--enterprise>`__
   (sgalinski)
 * `TypoScript plugin
   <https://plugins.jetbrains.com/plugin/11243-typoscript--enterprise>`__ (sgalinski)
-* :ref:`phpstorm-gerritplugin`
+ * `Gerrit plugin
+  <https://plugins.jetbrains.com/plugin/7272-gerrit>`__
 * `TYPO3 CMS Plugin
   <https://plugins.jetbrains.com/plugin/9496-typo3-cms-plugin>`__
 * `TYPO3 XLIFF Utility