updated documentation

Author: facontidavide

docs/tutorial_01_first_tree.md

@@ -12,6 +12,11 @@ information on console,
 but keep in mind that real "production" code would probably do something
 more complicated.
 
+Further, we will create this simple tree:
+
+
+![Tutorial1](images/Tutorial1.svg)
+
 ## How to create your own ActionNodes
 
 The default (and recommended) way to create a TreeNode is by inheritance.
@@ -102,7 +107,6 @@ We can build a `SimpleActionNode` from any of these functors:
 
 Let's consider the following XML file named __my_tree.xml__:
 
-![ReactiveFallback](images/Tutorial1.svg)
 
 ``` XML
  <root main_tree_to_execute = "MainTree" >

mkdocs.yml

@@ -2,7 +2,7 @@ site_name: BehaviorTree.CPP
 site_description: Introduction to Behavior Trees
 site_author: Davide Faconti
 
-copyright: 'Copyright © 2018-2019 Davide Faconti, Eurecat'
+copyright: 'Copyright © 2018-2022 Davide Faconti, Eurecat'
 
 theme:
   name: 'material'