First draft

.gitignore

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+wordpress-testing

assets/style.css

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+h1 { color: red; }

includes/views/kcw-overview.php

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+<?php
+// Prevent direct access to the file
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+/**
+ * Render the content of the custom admin page.
+*/
+function kcw_render_admin_page() {
+    ?>
+    <div class="wrap">
+        <h1><?php _e('Welcome to a KolliCloud Plugin Experiment', 'kcw'); ?></h1>
+        <p><?php _e('This is a custom admin interface example.', 'kcw'); ?></p>
+        <a href="<?php _e('https://login.local-it.org/', 'kcw') ?>" target="_blank"><?php _e('We coudl add also links here.', 'kcw'); ?></a>
+    </div>
+    <?php
+}

wp-kolli-plugin.php

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+<?php
+/**
+ * Plugin Name: WP Kollicloud Plugin
+ * Plugin URI: https://git.local-it.org/local-it/wp-kolli-plugin
+ * Description: a little bit of interface customization for Kollicloud.
+ * Version: 1.0
+ * Author: Local-IT
+ * Author URI: https://local-it.org
+ */
+
+// Prevent direct access to the file
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+// Include the custom kollicloud admin page template
+require_once plugin_dir_path(__FILE__) . 'includes/views/kcw-overview.php';
+
+/**
+ * Add a custom admin menu page.
+ */
+function kcw_add_admin_page() {
+    add_menu_page(
+        __('KolliCloud Dashboard', 'kcw'),      // Page title
+        __('KolliCloud', 'kcw'),                // Menu title
+        'manage_options',                       // Capability
+        'kolli-dash',                           // Menu slug
+        'kcw_render_admin_page',                // Callback function
+        'dashicons-cloud',                      // Icon
+        1                                       // Position
+    );
+    /* Optional submenu for redirect experiments */
+    add_submenu_page(
+		'kolli-dash',                           // Parent slug
+		'Back2KolliCloud',                      // Page title
+		'Zurück zum Login',                     // Menu title
+		'manage_options',                       // Capability
+		'gokollihome',                          // Menu slug
+		'kcw_render_sub_page',                  // Callback function
+    );
+}
+add_action('admin_menu', 'kcw_add_admin_page');
+
+function kcw_load_custom_wp_admin_style($hook) {
+    // Load only on ?page=sample-page not in sub menu
+    if( $hook != 'toplevel_page_kolli-dash') {
+        return;
+    }
+    wp_enqueue_style( 'custom_wp_admin_css', plugin_dir_url( __FILE__ ).'/assets/style.css' );
+}
+add_action( 'admin_enqueue_scripts', 'kcw_load_custom_wp_admin_style' );
+
+/**
+ Custom redirect for kollicloud.de
+*/
+function redirect_from_admin_menu($value) {
+  global $pagenow;
+  if (isset($_GET['page']) && $_GET['page'] === 'gokollihome') {
+    wp_redirect("http://kollicloud.de"); // Change to your target page
+    exit;
+  }
+}
+add_action('after_setup_theme', 'redirect_from_admin_menu');
+