fix: Tutorial Endpoints to Use HTTPS Instead of HTTP

[antoniamaia]

Description

This PR updates the tutorial to replace all http endpoints with https, ensuring the documentation reflects the correct and secure API URL.

Changes

• Replaced http://demo.scanapi.dev/api/v1/ with https://demo.scanapi.dev/api/v1/ across the tutorial.
• Improved consistency in documentation examples.
• Prevented potential confusion when accessing the API.

Motivation

Using https is essential for secure communication and aligns the tutorial with the actual API configuration.

Testing

• Reviewed all tutorial sections to ensure no http references remain.
• Validated that the updated endpoint works as expected.

Related Issue

Closes: #107

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[camilamaia]

Thank you soooo much, you saved the day