Add more prefetching of components

src/components/misc/error.vue

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+<template>
+	<div class="notification is-danger">
+		Loading failed, please <a @click="() => location.reload()">try again</a>.
+		If the error persists, please <a href="https://vikunja.io/contact/">contact us</a>.
+	</div>
+</template>
+
+<script>
+	export default {
+		name: 'error'
+	}
+</script>

src/components/misc/loading.vue

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+<template>
+	<div class="loader-container is-loading"></div>
+</template>
+
+<script>
+	export default {
+		name: 'loading'
+	}
+</script>
+
+<style scoped>
+	.loader-container {
+		height: 100%;
+		min-height: 200px;
+		width: 100%;
+		min-width: 600px;
+		max-width: 100vw;
+	}
+</style>