fix the intial slide

2019/2019-06-11_gitTraining/slides/index.md

-## Presentation Title
+## R3.school
 <br><br>
-#### Month XYth, 2019
+#### June 11th, 2019
 
 <div style="top: 6em; left: 0%; position: absolute;">
     <img src="theme/img/lcsb_bg.png">
 </div>
 
 <div style="top: 15em; left: 60%; position: absolute;">
-<h3><b>A catchy title</b></h3>
+<h3><b>git training for absolute beginners</b></h3>
 </div>
 
 <div style="top: 24em; left: 60%; position: fixed; width: 50%;">
-<b>Firstname LastName, Title</b><br>
-firstname.lastname@uni.lu<br>
+<b>Laurent Heirendt, Ph.D.</b><br>
+
+laurent.heirendt@uni.lu<br>
 <i>Luxembourg Centre for Systems Biomedicine</i>
 </div>