Redesign/course unit

[simaopsbarbosa]

Closes #1376

Current Progress

Checklist of Tasks

• Instructors Widget: Add and style the widget to display instructor information.
• Exams Row: Implement the row to display exam details.
• Exams Card Update: Add a variable in the exam card to show date
• Icons for Tabs: Add appropriate icons to the Info, Classes, and Files tabs for better navigation.
• Teacher Modal: Implement the modal to show detailed information about the teachers.
• Change base branch from develop to redesign:
• Update the generic modal: Update the generic modal to be in the style of the teacher modal
• Change the colors and the text style to use the UI style

NOTE: We currently don't fetch the info for the teacher modal so for now we only put mock text

Current State

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Final Mockup

Below is the mockup illustrating the desired final state :

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Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code