Remove CiviRules hooks

* They have been moved to the CiviRules Guide:
  https://docs.civicrm.org/civirules/en/latest/
* Close #183

docs/hooks/hook_civirules_alter_trigger_data.md

-# hook_civirules_alter_trigger_data
-
-## Description
-
-This hook is called for altering the trigger data object just before a
-trigger is triggered.
-
-## Definition
-
-    hook_civirules_alter_trigger_data(CRM_Civirules_TriggerData_TriggerData &$triggerData )
-
-## Returns
-
--   null
-
-## Example
-
-
-
-    /**
-    * Implements hook_civirules_alter_trigger_data
-    *
-    * Adds custom data to the trigger data object
-    */
-    function civirules_civirules_alter_trigger_data(CRM_Civirules_TriggerData_TriggerData &$triggerData) {
-
-      //also add the custom data which is passed to the pre hook (and not the post)
-
-      CRM_Civirules_Utils_CustomDataFromPre::addCustomDataToTriggerData($triggerData);
-
-    }
\ No newline at end of file

docs/hooks/hook_civirules_logger.md

-# hook_civirules_logger
-
-## Description
-
-This hook is called for return an object to do logging in CiviRules. The
-object should be instance of \Psr\Log\LoggerInterface or null if you
-want to disable the logging
-
-## Definition
-
-    hook_civirules_logger(\Psr\Log\LoggerInterface &$logger=null)
-
-## Returns
-
--   null
-
-## Example
-
-The example below returns a database logger for civirules.
-
-    function civiruleslogger_civirules_logger(\Psr\Log\LoggerInterface &$logger=null) {
-      if (empty($logger)) {
-        $logger = new CRM_Civiruleslogger_DatabaseLogger();
-      }
-    }
\ No newline at end of file

mkdocs.yml

@@ -183,9 +183,6 @@ pages:
     - hook_civicrm_tokens: hooks/hook_civicrm_tokens.md
     - hook_civicrm_tokenValues: hooks/hook_civicrm_tokenValues.md
     - hook_civicrm_unhandledException: hooks/hook_civicrm_unhandledException.md
-  - CiviRules hooks:
-    - hook_civirules_alter_trigger_data: hooks/hook_civirules_alter_trigger_data.md
-    - hook_civirules_logger: hooks/hook_civirules_logger.md
 - Documentation:
   - Writing Documentation: documentation/index.md
   - Documenting Extensions: documentation/extensions.md