Fix broken links

README.md

@@ -11,7 +11,7 @@ You need to be using [Gadgetbridge](https://gadgetbridge.org/) with your *Pebble
 The easiest way to use this projet is to:
 
   * download [RStudio](https://www.rstudio.com/products/rstudio/download/#download)
-  * download and open `[pebble_health_stats.Rmd](https://djib.fr/djib/PebbleHealthStats/src/branch/master/pebble_health_stats.Rmd)`
+  * download and open [pebble_health_stats.Rmd](https://djib.fr/djib/PebbleHealthStats/src/branch/master/pebble_health_stats.Rmd)
   * and press *Knit* on the top left of the editor.
 
 You will need to have [R](https://www.r-project.org/) running on you PC as well as the package [Tidyverse](https://www.tidyverse.org/).  
@@ -22,7 +22,7 @@ sudo apt install r-cran-tidyverse
 
 ## Demo
 
-Download and open `[pebble_health_stats.html](https://djib.fr/djib/PebbleHealthStats/raw/branch/master/pebble_health_stats.html)` for a demo of the output.
+Download and open [pebble_health_stats.html](https://djib.fr/djib/PebbleHealthStats/raw/branch/master/pebble_health_stats.html) for a demo of the output.
 
 ## If you want to go further