feat: full de-Angularization with Bootstrap 5 migration

- Removed AngularJS 1.4.8 completely — no more framework dependency
- Extracted core RCON logic into pure vanilla JS (js/rcon.js)
- Added lightweight hash-based SPA router (js/router.js)
- Rewrote all 6 pages as vanilla JS modules in js/pages/
- Migrated Bootstrap 3 → Bootstrap 5 (cards instead of panels, bootstrap-icons instead of glyphicons)
- Removed jQuery dependency (Bootstrap 5 is vanilla JS)
- Purged all Angular templates from html/
- Removed npm artifacts (package.json, node_modules)
- Added nginx.example.conf for static hosting
- Updated rcon.css dark theme for BS5 variables
- Static file only — no Node.js backend required

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

nginx.example.conf

@@ -0,0 +1,24 @@
+# Example nginx config for WebRcon
+# Copy the project files to /var/www/webrcon (or wherever you like)
+# and symlink this file into /etc/nginx/sites-enabled/
+
+server {
+    listen 80;
+    server_name rcon.yourdomain.com;
+
+    root /var/www/webrcon;
+    index index.html;
+
+    # SPA routing — all paths serve index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets aggressively (all deps are CDN-loaded anyway)
+    location ~* \.(css|js|svg|png|jpg|jpeg|gif|ico)$ {
+        expires 30d;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # No backend — browser talks WebSocket directly to the game server
+}