Add SuperPlane to Cloud Native Landscape

[hadzija7]

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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.
• Is your project closed source or, if it is open source, does your project have at least 300 GitHub stars?
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• Does it follow the other guidelines from the new entries section?
• Have you added your SVG to hosted_logos and referenced it there?
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What this PR adds

• Adds SuperPlane under Continuous Integration & Delivery in landscape.yml (alphabetical placement).
• Adds a stacked SVG logo at hosted_logos/superplane.svg and references it from the new item.

Project details

• Name: SuperPlane
• Homepage: https://superplane.com
• Repository: https://github.com/superplanehq/superplane
• Description: Open source DevOps control plane for event-driven workflows.

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