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.

src/App.vue

@@ -7,7 +7,7 @@
         <Navigation />
         <router-view v-slot="{ Component }">
             <keep-alive :max="5">
-                <component :key="$route.fullPath" :is="Component" />
+                <component :is="Component" :key="$route.fullPath" />
             </keep-alive>
         </router-view>