docs: add dataset ORM tutorial page and update navigation with GFM documentation

Add new Dataset ORM tutorial page covering CRUD operations, query operators, schema evolution, and JSON field handling. Update navigation.yaml to include the new tutorial in the tutorials section. Enhance markdown module documentation with GitHub Flavored Markdown support details including tables, task lists, and language identifier attributes for syntax highlighting. Update tutorial index page and pagination links to reflect the new tutorial order. Refactor dataset.wren module source to introduce Sql and QueryBuilder classes with soft-delete support and identifier validation.

manual_src/pages/tutorials/index.html

@@ -39,6 +39,15 @@
                         </div>
                     </div>
 
+                    <div class="card">
+                        <h3><a href="dataset-orm.html">Dataset ORM</a></h3>
+                        <p>Master the dataset module for effortless database operations with automatic schema management.</p>
+                        <div class="card-meta">
+                            <span class="tag">dataset</span>
+                            <span class="tag">sqlite</span>
+                        </div>
+                    </div>
+
                     <div class="card">
                         <h3><a href="template-rendering.html">Template Rendering</a></h3>
                         <p>Use Jinja templates to generate HTML pages, reports, and configuration files.</p>
@@ -73,7 +82,8 @@
 
                 <ol>
                     <li><strong>HTTP Client</strong> - Introduces async operations and JSON handling</li>
-                    <li><strong>Database Application</strong> - Covers data persistence and file I/O</li>
+                    <li><strong>Database Application</strong> - Covers raw SQLite data persistence</li>
+                    <li><strong>Dataset ORM</strong> - Effortless database operations with automatic schema</li>
                     <li><strong>Template Rendering</strong> - Learn the Jinja template system</li>
                     <li><strong>WebSocket Chat</strong> - Advanced async patterns with fibers</li>
                     <li><strong>CLI Tool</strong> - Bringing it all together in a real application</li>