Adjusted views, forms and cleaned urls.py

Added def __str__ for the models to appear nicely on the admin panel.

Changed schedule html file accordingly
Co-authored-by: Christine <cdeeerrr@users.noreply.github.com>
Co-authored-by: pinkboheme <pinkboheme@users.noreply.github.com>

- Edited Inventory.html to accommodate add inventory form
- Added addinventory.html, which contains the add ingredient form
- Edited forms.py, urls.py, views.py with addinventory
- Minor edits to addorder and css for better visuals

- created AddOrder static form
- created addorder view
- added stuff to urls.py
- created addorder.html
- connected add order button and addorder.html

tables in their respective views. Changed styles accordingly.

- configure settings.py
- create views functions
- link static files to templates