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.

test/markdown/autolinks.wren

@@ -0,0 +1,31 @@
+// retoor <retoor@molodetz.nl>
+
+import "markdown" for Markdown
+
+var httpUrl = "Visit https://example.com for info"
+var httpHtml = Markdown.toHtml(httpUrl)
+System.print(httpHtml.contains("<a href=\"https://example.com\">https://example.com</a>")) // expect: true
+
+var httpOnly = "Check http://test.org/path"
+var httpOnlyHtml = Markdown.toHtml(httpOnly)
+System.print(httpOnlyHtml.contains("<a href=\"http://test.org/path\">http://test.org/path</a>")) // expect: true
+
+var email = "Contact user@example.com today"
+var emailHtml = Markdown.toHtml(email)
+System.print(emailHtml.contains("mailto:user@example.com")) // expect: true
+System.print(emailHtml.contains(">user@example.com</a>")) // expect: true
+
+var noAutolink = "[Link](https://example.com)"
+var noAutolinkHtml = Markdown.toHtml(noAutolink)
+var count = 0
+var i = 0
+while (i < noAutolinkHtml.count - 4) {
+  if (noAutolinkHtml[i...i+5] == "href=") count = count + 1
+  i = i + 1
+}
+System.print(count) // expect: 1
+
+var multiUrl = "See https://a.com and https://b.com"
+var multiHtml = Markdown.toHtml(multiUrl)
+System.print(multiHtml.contains("href=\"https://a.com\"")) // expect: true
+System.print(multiHtml.contains("href=\"https://b.com\"")) // expect: true

test/markdown/blocks_advanced.wren

@@ -14,7 +14,7 @@ System.print(multiQuote.contains("line 1")) // expect: true
 System.print(multiQuote.contains("line 2")) // expect: true
 
 var withLang = Markdown.toHtml("```wren\nSystem.print(\"hello\")\n```")
-System.print(withLang.contains("<pre><code>")) // expect: true
+System.print(withLang.contains("<pre><code class=\"language-wren\">")) // expect: true
 System.print(withLang.contains("System.print")) // expect: true
 
 var emptyBlock = Markdown.toHtml("```\n\n```")

test/markdown/code_language.wren

@@ -0,0 +1,27 @@
+// retoor <retoor@molodetz.nl>
+
+import "markdown" for Markdown
+
+var js = "```javascript\nconst x = 1;\n```"
+var jsHtml = Markdown.toHtml(js)
+System.print(jsHtml.contains("class=\"language-javascript\"")) // expect: true
+System.print(jsHtml.contains("const x = 1;")) // expect: true
+
+var py = "```python\ndef foo():\n    pass\n```"
+var pyHtml = Markdown.toHtml(py)
+System.print(pyHtml.contains("class=\"language-python\"")) // expect: true
+System.print(pyHtml.contains("def foo():")) // expect: true
+
+var noLang = "```\nplain code\n```"
+var noLangHtml = Markdown.toHtml(noLang)
+System.print(noLangHtml.contains("language-")) // expect: false
+System.print(noLangHtml.contains("plain code")) // expect: true
+
+var wren = "```wren\nSystem.print(\"Hello\")\n```"
+var wrenHtml = Markdown.toHtml(wren)
+System.print(wrenHtml.contains("class=\"language-wren\"")) // expect: true
+
+var rust = "```rust\nfn main() {}\n```"
+var rustHtml = Markdown.toHtml(rust)
+System.print(rustHtml.contains("class=\"language-rust\"")) // expect: true
+System.print(rustHtml.contains("<pre><code")) // expect: true

test/markdown/tables.wren

@@ -0,0 +1,27 @@
+// retoor <retoor@molodetz.nl>
+
+import "markdown" for Markdown
+
+var basic = "| A | B |\n|---|---|\n| 1 | 2 |"
+var html = Markdown.toHtml(basic)
+System.print(html.contains("<table>")) // expect: true
+System.print(html.contains("<thead>")) // expect: true
+System.print(html.contains("<tbody>")) // expect: true
+System.print(html.contains("<th>A</th>")) // expect: true
+System.print(html.contains("<td>1</td>")) // expect: true
+
+var aligned = "| Left | Center | Right |\n|:---|:---:|---:|\n| L | C | R |"
+var alignedHtml = Markdown.toHtml(aligned)
+System.print(alignedHtml.contains("text-align:center")) // expect: true
+System.print(alignedHtml.contains("text-align:right")) // expect: true
+
+var multiRow = "| H1 | H2 |\n|---|---|\n| A | B |\n| C | D |"
+var multiHtml = Markdown.toHtml(multiRow)
+System.print(multiHtml.contains("<td>A</td>")) // expect: true
+System.print(multiHtml.contains("<td>D</td>")) // expect: true
+
+var inlineTable = "| **Bold** | *Italic* |\n|---|---|\n| `code` | [link](url) |"
+var inlineHtml = Markdown.toHtml(inlineTable)
+System.print(inlineHtml.contains("<strong>Bold</strong>")) // expect: true
+System.print(inlineHtml.contains("<em>Italic</em>")) // expect: true
+System.print(inlineHtml.contains("<code>code</code>")) // expect: true

test/markdown/task_lists.wren

@@ -0,0 +1,29 @@
+// retoor <retoor@molodetz.nl>
+
+import "markdown" for Markdown
+
+var unchecked = "- [ ] Task one"
+var uncheckedHtml = Markdown.toHtml(unchecked)
+System.print(uncheckedHtml.contains("task-list")) // expect: true
+System.print(uncheckedHtml.contains("<input type=\"checkbox\" disabled>")) // expect: true
+System.print(uncheckedHtml.contains("Task one")) // expect: true
+
+var checked = "- [x] Done task"
+var checkedHtml = Markdown.toHtml(checked)
+System.print(checkedHtml.contains("<input type=\"checkbox\" disabled checked>")) // expect: true
+System.print(checkedHtml.contains("Done task")) // expect: true
+
+var mixed = "- [ ] Todo\n- [x] Complete\n- [ ] Another"
+var mixedHtml = Markdown.toHtml(mixed)
+System.print(mixedHtml.contains("Todo")) // expect: true
+System.print(mixedHtml.contains("Complete")) // expect: true
+System.print(mixedHtml.contains("Another")) // expect: true
+
+var upperX = "- [X] Upper case X"
+var upperHtml = Markdown.toHtml(upperX)
+System.print(upperHtml.contains("checked")) // expect: true
+
+var regular = "- Normal item"
+var regularHtml = Markdown.toHtml(regular)
+System.print(regularHtml.contains("task-list")) // expect: false
+System.print(regularHtml.contains("<li>Normal item</li>")) // expect: true