Revamp Teman Kuliah

[rafiedel]

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Detailed description of changes

What's New

• Course grade calculator
• Tanya Teman Feature
• Onboarding guidance

What's Updated

• Flutter version
• Teman Kuliah onboarding appearance

New Package Added

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"dev_dependencies": 
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Recommendations on how to test the changes

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Checklist for developer

• The code builds clean without any errors or warnings
• The code does not contain commented out code
• The code does not log anything to console
• I have added unit test(s) to cover new code and successfully executed ran it
• I have thoroughly tested the new code and any adjacent features it may affect

Link to related issue(s)

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Screenshots or videos (before and after if appropriate)

Before

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After

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