Added download buttons for the XMRig miner to the windows/linux pages - ALPHA-28

[BasileF]

ALPHA-28	Title
#nb	Insert Title Here

Description

Give a brief description and context of what you are working on.

Implementation / Approach

Briefly describe your approach, design, implementation to solve the problem if applicable.

Checklist

• [ ] Appropriate Unit test coverage
• [ ] Manual top-hatting has been performed
• [ ] This PR is linted, tested and follows the best practices of the organization