fix: 📝 Use npm commands instead of make in docs

CONTRIBUTING.md

@@ -11,8 +11,8 @@ TODO
 
 Bismuth can be temporarily loaded without installing the script:
 
-    make run
-    make stop
+    npm run start
+    npm run stop
 
 Note that Bismuth can destroy itself completely once it is disabled, so no
 restart is required to deactivated it.

README.md

@@ -25,8 +25,13 @@ Project goals are the following:
 
 ## 🔧 Installation
 
-    make install
-    make uninstall # to uninstall the script
+Install script via script:
+
+    npm run script-install
+
+To uninstall:
+
+    npm run script-uninstall
 
 ### Enabling User-Configuration