add link to .md files

for each article
add in the bottom or top of the page 
a link or button 
whioch should go to the md version of the article


<img width="252" height="90" alt="Image" src="https://github.com/user-attachments/assets/ae4341be-2253-45ce-a366-b67e17b01929" />

<img width="259" height="56" alt="Image" src="https://github.com/user-attachments/assets/ae029704-51d1-462a-8cef-d82c246a2ce7" />