feat: adapt gitignore to eleventy

.gitignore

@@ -1,15 +1,25 @@
-# ---> Hugo
+# Generated files
-# Generated files by hugo
+package/generated*
-/public/
-/resources/_gen/
-/assets/jsconfig.json
-hugo_stats.json
 
-# Executable may be added to repository
+# Ignore installed npm modules
-hugo.exe
+node_modules/
-hugo.darwin
-hugo.linux
 
-# Temporary lock file while building
+# Ignore build tool output, e.g. code coverage
-/.hugo_build.lock
+.nyc_output/
+coverage/
 
+# Ignore API documentation
+api-docs/
+
+# Ignore folders from source code editors
+.vscode
+.idea
+
+# Ignore eleventy output when doing manual tests
+_site/
+
+package-lock.json
+
+# Ignore test files
+.cache
+test/stubs-layout-cache/_includes/*.js