Add API documentation and underground station importer

- Introduced a new HTML documentation page for the oradio API, including a JavaScript file to handle dynamic content and API requests.
- Added a CSS file for styling the documentation page.
- Implemented an underground station importer script that fetches data from Radio-Browser and writes it to a JSON file.
- Created a stats module to compute and manage vote and play statistics for radio stations.
- Added a polyfill for modulepreload to ensure compatibility with older browsers.

vite.config.js

@@ -2,23 +2,24 @@ import { defineConfig } from 'vite';
 import { resolve } from 'node:path';
 
 export default defineConfig({
-  root: 'web',
-  publicDir: false,
-  server: {
-    port: 5173,
-    proxy: {
-      '/api': 'http://localhost:4173',
-      '/ws': { target: 'ws://localhost:4173', ws: true }
+    root: 'web',
+    publicDir: false,
+    server: {
+        port: 5173,
+        proxy: {
+            '/api': 'http://localhost:4173',
+            '/ws': { target: 'ws://localhost:4173', ws: true }
+        }
+    },
+    build: {
+        outDir: '../server/public',
+        emptyOutDir: true,
+        rollupOptions: {
+            input: {
+                kiosk: resolve(__dirname, 'web/index.html'),
+                admin: resolve(__dirname, 'web/admin/index.html'),
+                docs: resolve(__dirname, 'web/docs/index.html')
+            }
+        }
     }
-  },
-  build: {
-    outDir: '../server/public',
-    emptyOutDir: true,
-    rollupOptions: {
-      input: {
-        kiosk: resolve(__dirname, 'web/index.html'),
-        admin: resolve(__dirname, 'web/admin/index.html')
-      }
-    }
-  }
 });