My Tasks view: Add column headings

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Headings: "Task Title", "Reassign", "Due Date"

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@Mattimus333 Want to work on this one? Should be quick. Just make sure it looks good on mobile! Thanks.

[elimisteve]

@Mattimus333 You can find the screen here: http://localhost:8081/pursuance/1/members

[elimisteve]

@Mattimus333 Also, http://localhost:8081/pursuance/1/my_tasks