chore: merge batch of approved PRs

[marcnjaramillo]

This merges the following PRs:

• Fixed the "Repeating background image" - authored by @yahya-cloud
• Temperature Conversion from Celsius to Farenheit to Kelvin and Vice Versa - authored by @ThunderBolt-OS and @samarthya-jha
• add firebase.js file, add Signup component, add AuthContext file, add… - authored by @judytafilipkowska and @prakharrathi25

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