R tutorial - fix image URL

Author: hcartiaux

maths/R/PS11_targets.html

@@ -107,7 +107,7 @@
 ### DLSM University of Luxembourg
 
 
-<img src="https://raw.githubusercontent.com/ULHPC/documents/master/roll-ups/ULHPC-RollUp.png" style="height:550px;position: absolute;bottom: 1em;left: 1em;"/>
+<img src="https://raw.githubusercontent.com/ULHPC/tutorials/devel/maths/R/img/ULHPC-RollUp.png" style="height:550px;position: absolute;bottom: 1em;left: 1em;"/>
 
 <img src="img/logo_hpc-shool2021.png" style="height:150px;position: absolute;bottom: 1em;right: 1em;"/>
 

maths/R/targets.Rmd

@@ -100,7 +100,7 @@ library(xaringanExtra) # gadenbuie/xaringanExtra
 
 
 ```{r, echo = FALSE}
-htmltools::img(src = "https://raw.githubusercontent.com/ULHPC/documents/master/roll-ups/ULHPC-RollUp.png",
+htmltools::img(src = "https://raw.githubusercontent.com/ULHPC/tutorials/devel/maths/R/img/ULHPC-RollUp.png",
                style = "height:550px;position: absolute;bottom: 1em;left: 1em;")
 ```
 

maths/R/targets.html

@@ -2836,7 +2836,7 @@
 ### Aurélien Ginolhac, Dpt. Life Sciences and Medecine
 
 
-<img src="https://raw.githubusercontent.com/ULHPC/documents/master/roll-ups/ULHPC-RollUp.png" style="height:550px;position: absolute;bottom: 1em;left: 1em;"/>
+<img src="https://raw.githubusercontent.com/ULHPC/tutorials/devel/maths/R/img/ULHPC-RollUp.png" style="height:550px;position: absolute;bottom: 1em;left: 1em;"/>
 
 <img src="img/logo_hpc-shool2023.png" style="height:150px;position: absolute;bottom: 1em;right: 1em;"/>