Removed unused alt-hero field

[h3nry-m]

Fixes #3209

What changes did you make and why did you make them ?

• Removed the unused alt-hero field because it was not being used anywhere in the code page since the image-hero was being used as a background image.
• As a result it'll reduce unnecessary code as well as reduce time to review code and load the website.

[github-actions]

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[Suman2795]

Good Job @h3nry-m ! Your pull request is done into the correct branch and you have linked it to the correct issue. Your changes look correct which removes the unnecessary code.