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

public/fonts/roboto/roboto.css

@@ -0,0 +1,15 @@
+@font-face {
+  font-family: "Roboto";
+  src: url("/fonts/roboto/Roboto-Regular.woff2") format("woff2");
+  font-weight: 400;
+}
+@font-face {
+  font-family: "Roboto";
+  src: url("/fonts/roboto/Roboto-Medium.woff2") format("woff2");
+  font-weight: 500;
+}
+@font-face {
+  font-family: "Roboto";
+  src: url("/fonts/roboto/Roboto-Bold.woff2") format("woff2");
+  font-weight: 700;
+}