feat: add disk usage information to the sidebar

frontend/package.json

@@ -21,12 +21,15 @@
     "moment": "^2.29.2",
     "normalize.css": "^8.0.1",
     "noty": "^3.2.0-beta",
+    "pretty-bytes": "^6.0.0",
     "qrcode.vue": "^1.7.0",
     "utif": "^3.1.0",
     "vue": "^2.6.10",
+    "vue-async-computed": "^3.9.0",
     "vue-i18n": "^8.15.3",
     "vue-lazyload": "^1.3.3",
     "vue-router": "^3.1.3",
+    "vue-simple-progress": "^1.1.1",
     "vuex": "^3.1.2",
     "vuex-router-sync": "^5.0.0",
     "whatwg-fetch": "^3.6.2"