Improve convert_openai_markdown_to_slack code

[kelyacf]

as a example (from chat GPT)

import re

def convert_markdown_to_mrkdwn(markdown_text):
# Convert headers
markdown_text = re.sub(r'(^|\n)### (.)', r'\1 \2*\n', markdown_text)
markdown_text = re.sub(r'(^|\n)## (.)', r'\1** \2**\n', markdown_text)
markdown_text = re.sub(r'(^|\n)# (.)', r'\1*** \2***\n', markdown_text)

# Convert bold and italic text
markdown_text = re.sub(r'\*\*\*(.*?)\*\*\*', r'*\1*', markdown_text)
markdown_text = re.sub(r'\*\*(.*?)\*\*', r'*\1*', markdown_text)
markdown_text = re.sub(r'\*(.*?)\*', r'_\1_', markdown_text)

# Convert links
markdown_text = re.sub(r'\[(.*?)\]\((.*?)\)', r'<\2|\1>', markdown_text)

# Convert inline code
markdown_text = re.sub(r'`(.*?)`', r'`\1`', markdown_text)

# Convert code blocks
markdown_text = re.sub(r'```(.*?)```', r'```\1```', markdown_text, flags=re.DOTALL)

return markdown_text

Example usage

markdown_text = """

Header 1

Header 2

Header 3

Bold text

Italic text

Bold and Italic text

Link

Inline code