Fix #43 and #67: Fix extraction of '# 'lines inside code blocks

[kip2]

Summary

Fixes #43 and #67.

This pull request addresses an issue where lines starting with # inside code blocks were incorrectly extracted and converted into WikiLinks. These lines should be ignored during heading extraction.

Changes

• Updated the heading extraction logic to skip lines that start with # inside fenced code blocks.

Related Issues

• Closes #43
• Closes #67