Add home page component; fix user state issues

must be sure to keep "anonymous" user represented as {} instead of
null, otherwise getting errors.  this also fixes the menu upon user
login; previously it wasn't showing most options

src/components/home/ByjoveHome.vue

@@ -0,0 +1,55 @@
+<template>
+  <div>
+    <img :alt="`${appsettings.systemTitle} logo`" :src="appsettings.logo" />
+    <h1>Welcome to {{ appsettings.appTitle }}</h1>
+  </div>
+</template>
+
+<script>
+export default {
+    name: 'ByjoveHome',
+    props: {
+        appsettings: {
+            type: Object,
+        },
+        forceLogin: {
+            type: Boolean,
+            default: false,
+        },
+    },
+    data() {
+        return {
+            inited: false,
+        }
+    },
+    created() {
+        this.init()
+    },
+    watch: {
+        '$store.state.session_established': 'init',
+    },
+    methods: {
+        init() {
+            if (this.inited) return
+
+            // nothing to check, unless login is to be enforced
+            if (!this.forceLogin) {
+                this.inited = true
+                return
+            }
+
+            // cannot init until session is established
+            if (!this.$store.state.session_established) {
+                return
+            }
+
+            this.inited = true
+
+            // send anonymous users to login page
+            if (!this.$store.state.user.uuid) {
+                this.$router.push('/login')
+            }
+        },
+    },
+}
+</script>

src/components/home/index.js

@@ -0,0 +1,28 @@
+// Import vue component
+import ByjoveHome from './ByjoveHome.vue'
+
+// Declare install function executed by Vue.use()
+export function install(Vue) {
+    if (install.installed) return;
+    install.installed = true;
+    Vue.component('ByjoveHome', ByjoveHome);
+}
+
+// Create module definition for Vue.use()
+const plugin = {
+    install,
+};
+
+// Auto-install when vue is found (eg. in browser via <script> tag)
+let GlobalVue = null;
+if (typeof window !== 'undefined') {
+    GlobalVue = window.Vue;
+} else if (typeof global !== 'undefined') {
+    GlobalVue = global.Vue;
+}
+if (GlobalVue) {
+    GlobalVue.use(plugin);
+}
+
+// To allow use as module (npm/webpack/etc.) export component
+export default ByjoveHome