Replace v1 with v2 codebase

Full rewrite: swap out the v1 framework (src/, controllers/, views/,
twig/, sass/, skeleton/) for the working v2 codebase from phpproject
(App/, novaconium/, public/).

App/config.php

@@ -0,0 +1,23 @@
+<?php
+
+// Override any subset of novaconium/config.php's defaults here — only list
+// the keys you want to change. novaconium/bootstrap.php (and
+// novaconium/bin/clear-cache.php) shallow-merge this over the framework
+// defaults; see /admin/docs/config. Uncomment and adjust any of the
+// examples below, or leave this file returning an empty array to keep
+// every framework default as-is.
+return [
+    // 'debug' => false,
+
+    // 'site_name' => 'My Site',
+
+    // Docs: /admin/docs/matomo
+    // 'matomo_url'     => 'https://matomo.example.com/',
+    // 'matomo_site_id' => '1',
+
+    // Docs: /admin/docs/admin-auth — generate a hash with:
+    //   php -r "echo password_hash('yourpassword', PASSWORD_DEFAULT), PHP_EOL;"
+    // or use the built-in /admin/password-hash form.
+    // 'admin_username'      => 'admin',
+    // 'admin_password_hash' => '$2y$10$...',
+];