Added TypeScript for frontend

Added type definitions for components, functions, data
Added guards for network responses
fixes #8

front/vite.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+const BACK_ADDRESS = 'http://127.0.0.1:8000'
+
+// https://vitejs.dev/config/
+export default defineConfig(
+  ({ command }) => ({
+    base: (command === 'serve') ? "/" : "/static",
+    plugins: [react()],
+    server: {
+      proxy: {
+        '/api': BACK_ADDRESS,
+        '/static': BACK_ADDRESS,
+        '/uploads': BACK_ADDRESS
+      }
+    }
+  })
+)