fix(fonts): localize fonts and icons to remove CDN dependencies

- install @mdi/font and @fortawesome/fontawesome-free
- move required font files to public/fonts (roboto, mdi, fontawesome)
- load fonts via public/index.html instead of CDN
- remove font imports from main.js

package.json

@@ -18,6 +18,7 @@
     "izitoast": "^1.4.0",
     "lodash": "^4.17.21",
     "material-design-icons-iconfont": "^6.7.0",
+    "roboto-fontface": "^0.10.0",
     "vue": "^2.6.14",
     "vue-chartist": "^2.1.2",
     "vue-chartjs": "^4.1.1",