Expand .gitignore for Laravel, update README with one-command setup, simplify env configs

src/.gitignore

@@ -0,0 +1,23 @@
+/.phpunit.cache
+/node_modules
+/public/build
+/public/hot
+/public/storage
+/storage/*.key
+/storage/pail
+/vendor
+.env
+.env.backup
+.env.production
+.phpactor.json
+.phpunit.result.cache
+Homestead.json
+Homestead.yaml
+npm-debug.log
+yarn-error.log
+/auth.json
+/.fleet
+/.idea
+/.nova
+/.vscode
+/.zed