👷(ci) fix copy folder on yarn install bug

Depending on the OS the cp folder/ directory does not always copy the
content of the folder like on MacOS but the directory itself. To fix
this inconsistency, I added the dot syntax.

package.json

@@ -10,7 +10,7 @@
     "format": "prettier --check \"**/*.{css,ts,tsx,md,json,cjs,js}\"",
     "format:fix": "prettier --write \"**/*.{css,ts,tsx,md,json,cjs,js}\"",
     "cms": "npx decap-server",
-    "copy-cms-dsfr": "cp -r node_modules/@gouvfr/dsfr/dist/ public/assets/cms/dsfr && postcss public/assets/cms/dsfr/dsfr.min.css -o public/assets/cms/dsfr/dist/dsfr.min.css",
+    "copy-cms-dsfr": "cp -r node_modules/@gouvfr/dsfr/dist/. public/assets/cms/dsfr && postcss public/assets/cms/dsfr/dsfr.min.css -o public/assets/cms/dsfr/dist/dsfr.min.css",
     "copy-cms-styles": "postcss src/styles/globals.css -o public/assets/cms/globals.css",
     "copy-cms-assets": "npm run copy-cms-dsfr && npm run copy-cms-styles",
     "postinstall": "npm run copy-cms-assets"