Make eslint work, and fix all warnings. (#511)

* Make eslint work, and fix all warnings.

* Don't ignore v-html rule globally.

* Remove eslint file and merge in package.json.

babel.config.js

@@ -1,5 +1,3 @@
 module.exports = {
-  presets: [
-    '@vue/cli-plugin-babel/preset'
-  ]
-}
+    presets: ["@vue/cli-plugin-babel/preset"],
+};