Delete from all instances as lists' owner and unfollow shared lists

[EmmaBin]

Description

This PR resolves a bug where, when a list owner deletes a list, it would be removed from all instances, including for users it was shared with. For users who have the list shared with them, they can only unfollow the list—removing it from their sharedWithMe array—but not delete the original list. I also changed the delete icon to a remove icon for shared lists.

Related Issue

closes #60

Acceptance Criteria

• When a user deletes a list that they have created and shared, the list is gone from all collections
• When a user deletes a list that they have been shared to, but do not own, the list is removed from their collection, but not every collection that list belongs to. (I.e., the creator of a list is the only user who can permanently delete a list)

Type of Changes

bug fix enhancement

Updates

After

Testing Steps / QA Criteria

1. go to eb-deletion-issue-32branch.
2. Share some lists with other users and check the updates in Firebase under the 'sharedWithMe' lists.
3. Delete the list shared with other users and confirm that it is removed from the 'sharedWithMe' lists.

[github-actions]

Visit the preview URL for this PR (updated for commit 999f350):

https://tcl-76-smart-shopping-list--pr66-eb-deletion-issue-32-7l9fs9s3.web.app

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[arandel1]

Awesome!! Love the update to the icon!