Pull request1

[haasr]

I updated your project to work with the current Django version (4.2.3). I tried to avoid changes that would break the Heroku deployment but I did not test deploying to Heroku.

Changes (visual overview -- https://github.com/haasr/MyPorfolio/blob/master/README.rst):

• Added 'featured' boolean to artwork model. Set to true -> display in the home page carousel.
• Added argument to art_detail function so user can follow a return link back to gallery.
• Set 404 handler to handle 404s in current Django version.
• Lightly padded gallery images & other small design changes.
• Added a context processor to automatically populate the navigation with the existing gallery groups.