fix: add scoped error logging for lexer/parser errors

- Add std.log.scoped(.pugz) to template.zig and view_engine.zig
- Log detailed error info (code, line, column, message) when parsing fails
- Log template path context in ViewEngine on parse errors
- Remove debug print from lexer, use proper scoped logging instead
- Move benchmarks, docs, examples, playground, tests out of src/ to project root
- Update build.zig and documentation paths accordingly
- Bump version to 0.3.1

tests/sample_data/pug/test/markdown-it/index.test.js

@@ -0,0 +1,13 @@
+const pug = require('../../');
+
+test('inline and include markdow-it should match ', () => {
+  const outputMarkdownInline = pug.renderFile(
+    __dirname + '/layout-markdown-inline.pug'
+  );
+
+  const outputMarkdownIncludes = pug.renderFile(
+    __dirname + '/layout-markdown-include.pug'
+  );
+
+  expect(outputMarkdownIncludes).toEqual(outputMarkdownInline);
+});