Functionality to withdraw remaining funds post distributions.

[adityabhattad2021]

Description:

Closes #21

This PR addresses the functionality to allow users to withdraw remaining tokens from the funding vault after the tally date has passed. The following changes have been implemented:

Smart Contract

• Added a variable to keep track of the total funds distributed.
• Introduced a mapping to record the amount deposited by each user.
• Implemented a function to withdraw remaining funds post-distribution.
• Added relevant getter functions to retrieve necessary data.
• Included tests to ensure the new functionality works correctly.

Database

• Added an isDistributed variable for the funding vault to track the distribution status.

API Routes

• Added an API route to update the funding vault information, (for now to update the isDistributed field).

Frontend

• Modified the "Distribute Funds" button to update the database after a successful smart contract call.
• Added a button for users to withdraw remaining funds post-distribution.

UI Enhancements

• Added two additional cards on the results page:
  1. Displaying the amount of funds actually distributed.
  2. Indicating whether the funds have been distributed.
• Differentiated cards for actions post-tally and post-distribution to improve user experience.