Migrate from npm to pnpm

Author: stephane-klein

.tool-versions

@@ -0,0 +1,2 @@
+nodejs 16.15.1
+pnpm 7.1.7

README.md

@@ -13,13 +13,13 @@ Fill `.envrc` file with your GitLab application parameters
 Install packages:
 
 ```
-$ npm install
+$ pnpm install
 ```
 
 Launch application:
 
 ```
-$ npm run dev
+$ pnpm run dev
 ```
 
 Open your browser on http://127.0.0.1:3000