fix: Centered <h2> tag by adding mx-auto class

[Beto91401]

Fixes Issue

Closes #405

Changes proposed

• Centered <h2> tag by adding mx-auto class in hero.svelte.

Check List (Check all the applicable boxes)

• [X ] My code follows the code style of this project.
• [X ] My change requires changes to the documentation.
• [X ] I have updated the documentation accordingly.
• [X ] All new and existing tests passed.
• [X ] This PR does not contain plagiarized content.
• [X ] The title of my pull request is a short description of the requested changes.

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Note to reviewers