Add Ability to Filter Tasks by Deadline

[vidhitamittal]

Summary:
Enhance the to-do list application's home page by introducing a feature to filter tasks based on their deadlines. This functionality will allow users to view tasks in a more organized manner, focusing on due dates such as upcoming, overdue, or tasks due today.

Objectives:

• Provide a mechanism to filter tasks on the home page based on their deadlines.
• Allow sorting tasks by ascending or descending deadline order for improved usability.

Changes:

• Update the python script to support queries for filtering tasks by specific deadline criteria (e.g., due today, overdue, or due within a specified timeframe).
• Add a filter option (e.g., dropdown) to the home page interface for selecting deadline criteria.
• Implement logic to fetch and sort tasks by deadline in ascending or descending order. Use SQL queries to fetch tasks matching conditions such as deadline = CURRENT_DATE (due today).
• Add queries to sort tasks by deadlines (ORDER BY deadline ASC/DESC).
• Use Flask templates to render tasks based on the selected filter or sort criteria.

Benefits:

• Better Task Organization: Users can easily focus on tasks with pressing deadlines, helping them prioritize more effectively.
• Improved Usability: A streamlined view of tasks by deadlines reduces clutter for users managing multiple tasks.