VTag: Use computed property for router link

```html
<router-link
  :to="{ name: 'home-tag', params: { tag: name } }"
  :class="className"
>
```

Ideally, `{ name: 'home-tag', params: { tag: name } }` should be a computed property and then used like:

```html
<router-link
  :to="homeLink"
  :class="className"
>
```

Related resources:

-  https://vuejs.org/v2/guide/computed.html