Stumbling over and over in Django

For my first project, I have written some base files, to get a web page with a couple of images and a menu. Extended it with a second app to tweak the menu names and page contents.

All good so far, I add in a separate html file for a contacts page a py file for the form content and a couple of changes in the view sand urls. It works and showed the form.

Then I push it to git and the format of the page is lost and the image links are broken.

Even when I revert all the changes I made it still remains broken.

Does anyone know what I am doing wrong?