Added heap data structure in DSA

[jency1]

Pull Request

Description

Added heap data structure in DSA section.

@jfmartinz Please review and merge this PR.

Closes #1574

Type of change

• [x] Adding a new Resource
• [x] Adding a new Category
• [x] Documentation enhancement or fixes
• [x] Website enhancement or fixes

Checklist:

• [x] I read carefully CONTRIBUTING.md
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation

[github-actions[bot]]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊