fixed user guide generation script on mac + removed package-lock.json

Author: Vrixyz

README.md

@@ -14,20 +14,20 @@ $ yarn
 $ ./generate_user_guides.sh
 ```
 
-This command reads the templates directory and extracts specific instructions for bevy / rust / rapier integrations.
+Above command reads the templates directory and extracts specific instructions for bevy / rust / rapier integrations.
 It also injects code contained in the example files.
 
 ```sh
 $ yarn build
 ```
 
-This command generates static content into the `build` directory and can be served using any static contents hosting service.
+Above command generates static content into the `build` directory and can be served using any static contents hosting service.
 
 ```sh
 $ yarn start
 ```
 
-This command builds and starts a local development server and open up a browser window. Most changes are reflected live without having to restart the server.
+Above command builds and starts a local development server and open up a browser window. Most changes are reflected live without having to restart the server.
 
 ### Deployment
 

generate_user_guides.sh

@@ -1,12 +1,14 @@
 #!/bin/bash
 set -v
 
-if [ gsed -v ]; then
+if gsed --help >  /dev/null 2>&1; then
     gsed=gsed
+    echo "gsed found: using gsed."
 else
     # Hopefully installed sed is the gnu one.
     # note: aliases work poorly with xargs.
     gsed=sed
+    echo "gsed not found: using sed."
 fi
 
 mkdir -p docs/user_guides/rust/