Update Kusk, Monokle, Testkube Logos + Description

[yllek]

Refresh logos, small update to Testkube description

Pre-submission checklist:

Please check each of these after submitting your pull request:

• [ ] Are you only including a repo_url if your project is 100% open source? If so, you need to pick the single best GitHub repository for your project, not a GitHub organization.
• [x] Is your project closed source or, if it is open source, does your project have at least 300 GitHub stars?
• [x] Have you picked the single best (existing) category for your project?
• [ ] Does it follow the other guidelines from the new entries section?
• [x] Have you added your SVG to hosted_logos and referenced it there?
• [x] Does your logo clearly state the name of the project/product and follow the other guidelines?
• [x] Does your project/product name match the text on the logo?
• [x] Have you verified that the Crunchbase data for your organization is correct (including headquarters and LinkedIn)?

[github-actions[bot]]

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[!NOTE] This feature is still experimental and may not work as expected in some cases. Please report any issues you find!

[castrojo]

Woo! Just need you to accept the DCO in order to merge, thanks!

[caniszczyk]

@yllek can you re-submit with DCO (i.e., git commit -s)