Drop documentation for `remove-project`

`remove-project` has not fully been tested and was not doing what it
said on the tin. The newer stable branches have `remove-project` fixed.
But as gerrit upstream will soon end support for 2.16, we simple drop
support for the action instead of fixing on this old branch. That way,
old users of the plugin can still use it as they did before. And new
users of won't see the action and hence not use it.

Change-Id: I1f2ef0fcf57522b3d3c18fdb8cf4e4d6274f3ac6
diff --git a/src/main/resources/Documentation/config-rulebase-plugin-actions.md b/src/main/resources/Documentation/config-rulebase-plugin-actions.md
index 9fb7bf7..0662ff1 100644
--- a/src/main/resources/Documentation/config-rulebase-plugin-actions.md
+++ b/src/main/resources/Documentation/config-rulebase-plugin-actions.md
@@ -7,9 +7,6 @@
 [`add-project`][action-add-project]
 : adds a project to the task
 
-[`remove-project`][action-remove-project]
-: removes a project from the task
-
 [basic-actions]: config-rulebase-common.html#actions
 
 [action-add-project]: #action-add-project
@@ -24,18 +21,6 @@
 
 adds the project `MyCoolProject` to the task.
 
-[action-remove-project]: #action-remove-project
-### <a name="action-remove-project">Action: remove-project</a>
-
-The `remove-project` action removes a project from the task. The first
-parameter is the project name to remove. So for example
-
-```
-  action = remove-project MyCoolProject
-```
-
-removes the project `MyCoolProject` from the task.
-
 
 [Back to @PLUGIN@ documentation index][index]