Merge pull request #3109 from UlisesGascon/docs/improve-contributing

Improved installation steps

CONTRIBUTING.md

@@ -49,10 +49,21 @@ If you're writing content, see the [style guide](./docs/styleguide.md) to help y
 
 This site is powered by [Jekyll](https://jekyllrb.com/). Running it on your local machine requires a working [Ruby](https://www.ruby-lang.org/en/) installation with [Bundler](https://bundler.io/).
 
-Once you have that set up, run:
+Once you have that set up:
 
-    script/bootstrap
-    script/server
+1. Grant execution permissions to the scripts:
+
+```bash
+chmod +x script/bootstrap
+chmod +x script/server
+```
+
+2. Execute the scripts:
+
+```bash
+./script/bootstrap
+./script/server
+```
 
 …and open <http://localhost:4000> in your web browser.