feat(RSS-ECOMM-5_19): implement about us page

[Kleostro]

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• Implement About Us page.

Provide any other relevant information 🦉

• Fix year at the promo code.

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[Kleostro]

update birthday promo code dates

[Kleostro]

[sprint_4] 📸💼 Issue RSS-ECOMM-4_19: Craft a Detailed Team Description with Photos (25 points)