Improve link to installation R script

Author: damianooldoni

content/tutorials/r_brms/index.md

@@ -8,7 +8,7 @@ tags: ["generalized linear regression", "brms", "r", "mixed models"]
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 In the fall of 2023, a tutorial on Bayesian statistics with the [**brms**](https://paul-buerkner.github.io/brms/) packages was organised at INBO.
-Before you start the tutorial, please follow the instructions in [this R script](https://github.com/inbo/tutorials/tree/master/content/tutorials/r_brms/brms_eng/install_packages.R) to install brms properly.
+Before you start the tutorial, please follow the instructions in [this R script](https://github.com/inbo/tutorials/blob/master/content/tutorials/r_brms/brms_eng/install_packages.R) to install brms properly.
 All course material can be found in Dutch and English on the following pages:
 
 - The [English tutorial](../../html/workshop_1_mcmc_en_brms_eng.html) with all [course material](https://github.com/inbo/tutorials/tree/master/content/tutorials/r_brms/brms_eng) to test the examples yourself.