fix(views): Fix error when removing non-existing task

[igorsimb]

Fixes #34 Also updated django-celery-beat to the latest version.

Summary by CodeRabbit

• New Features

  • Added a conditional display for the delete schedule button in the schedule creation form.
  • Introduced a new utility function to check the existence of periodic tasks.

• Bug Fixes

  • Corrected a duplicated tab in a command snippet within the documentation.

• Chores

  • Updated Django, django-celery-beat, and django-timezone-field to newer versions for improved security and functionality.

[coderabbitai[bot]]

Walkthrough

## Walkthrough The changes involve enhancing the functionality and stability of a Django application by introducing conditional rendering in the UI, adding backend validation for task existence, and updating dependencies. Specifically, the modifications ensure that a delete button for a scheduling task is only shown if the task exists, preventing errors when attempting to delete non-existent tasks. Additionally, the application's dependencies are updated for better performance and security. ## Changes | File Path | Change Summary | |-----------|----------------| | `main/.../create_interval_form.html` | Conditional display of delete button based on task existence | | `main/utils.py` | Added function to check for periodic task existence | | `main/views.py` | Enhanced security with `user_passes_test` and integrated task existence check | | `commands.md` | Corrected a duplicated tab in command snippet | | `requirements.txt` | Updated versions for Django, django-celery-beat, and django-timezone-field | ## Assessment against linked issues | Objective | Addressed | Explanation | |-----------|-----------|-------------| | Prevent `DoesNotExist` error when deleting non-existent intervals (#34) | ✅ | |

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