Fix gitignore (track linter configs and package.json)

.eslintrc

@@ -0,0 +1,3 @@
+{
+  "extends": "@upstatement/eslint-config/vue"
+}

.gitignore

@@ -1,20 +1,72 @@
-node_modules
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+/sitespeed-result
 
-.DS_Store
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
 
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# dotenv environment variable files
 .env
-.env.local
 .env.development
-.env.test
 .env.production
 
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
+# gatsby files
+.cache/
+public
 
-.vscode/
+# Mac files
+.DS_Store
 
-.eslintrc
-package-lock.json
-package.json
-prettier.config.js
+# Yarn
+yarn-error.log
+.pnp/
+.pnp.js
+# Yarn Integrity file
+.yarn-integrity