added missing thumbnails and deleted previous version of dice game .

[wre9-tesh]

Description

added missing thumbnails and deleted previous version of dice game ,also changed link for calculators section so that i redirects to calculatorspage.html instead of error page.

Fixes: #519

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have made this from my own
• [ ] I have taken help from some online resourses
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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[github-actions[bot]]

Our team will soon review your PR. Thanks @wre9-tesh :)

[github-actions[bot]]

Thank you @wre9-tesh for taking out your valuable time in order to contribute to our project. Looking forward for more such amazing contributions :)