feat: personal insights + model update + deletion of account

[Jatewo]

Description

This is a merged PR of PRs #30, #35, and #36

Changes

• functionality implemented for personal insights
• personal insights now contains dynamic information about name, total subscribers and average star rating
• shows count of courses with each status
• written tests for the above functionality
• update tests and their snapshots
• added key[i] to Carousel.tsx
• Move course stat functions into helper file
• modifiedAt changed to dateUpdated
• createdAt changed to dateCreated
• Added a "delete account" button with a popup massage.
• Added a simple localStorage.setItem("id", res.data.userInfo.id) in the login page so it is possible to fetch the users id when calling the delete route.

Checklist

• [x] Code has been tested locally and passes all relevant tests.
• [x] Documentation has been updated to reflect the changes, if applicable.
• [x] Code follows the established coding style and guidelines of the project.
• [x] All new and existing tests related to the changes have passed.
• [x] Any necessary dependencies or new packages have been properly documented.
• [x] Pull request title and description are clear and descriptive.
• [x] Reviewers have been assigned to the pull request.
• [x] Any potential security implications have been considered and addressed.
• [x] Performance impact of the changes has been evaluated, if relevant.

If mobile/frontend pull request, what version of the backend is it stable, and running on?

Branch: dev

Notes for Reviewers

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