Add the proper Log-In button info

Sign in
```html
<li class="nav-item">
    <a href="/login"><icon icon="sign-in-alt" class="mr-2" /><span>Sign-In</span></a>
</li>
```

Sign out:
```html
<li class="nav-item" v-if="isAuthenticated">
    <a href="/logout"><icon icon="sign-in-alt" flip="horizontal" class="mr-2" /><span>Sign-Out</span></a>
</li>
```