mdb-navbar fix for ssr in nuxt

Expected behavior Navbar should work with SSR

Actual behavior Using Navbar with SSR causing 'window is not defined' error.

Resources (screenshots, code snippets etc.)

Example component:

<template>
    <mdb-navbar position="top" light>
        <mdb-navbar-nav>
            <span>DEMO</span>
        </mdb-navbar-nav>
    </mdb-navbar>
</template>

<script>
    import {mdbNavbarNav, mdbNavbar} from 'mdbvue'

    export default {
        components: {mdbNavbarNav, mdbNavbar}
    };
</script>

This simple component should work with SSR but it causes a 'window is not defined' error on the server side.

I came up with two solutions the first and not prefered one is to simply disable ssr for the component by wrapping <mdb-navbar> in <no-ssr> tag.

The second and prefered solution involves a change of the mdb-navbar component. Simply moving the content from the created() livecycle event to the mounted() livecycle event fixes the problem.