Task card icon

[PrerakMathur20]

Description

To improve visibility and appearance, with help of Material UI, Task Icons, and Edit Task icons have been added.
For obvious reasons, a "✔️" is easier to read rather than "Mark Completed", and/or "Mark Incomplete".

NOTE: Edit button is dormant as of now. And functionality is yet to be added.
Edit Button Functionality to be added via #288

Fixes #301

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

None required.

Also, include screenshots for the verification and reviewing purpose.

• Task Completed Card with Edit Icon

• Task Incomplete Card with Edit Icon

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (N/A)
• New and existing unit tests pass locally with my changes (N/A)
• Any dependent changes have been merged and published in downstream modules (N/A)

[PrerakMathur20]

I have made the changes asked. Kindly review them.