chore: remove old installation docs

[robbeverhelst]

Summary by Sourcery

Documentation:

• Remove outdated installation documentation for existing clusters.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR removes outdated documentation for installing on existing clusters.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed outdated installation documentation for existing clusters.	Removed files related to outdated installation methods. Removed references to legacy installation procedures.	docs/launch-platform/self-hosted/installing-on-an-existing-cluster/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/introduction.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/auth-api-requests.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/completing-setup-and-deploying.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/download/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/download/download-airgap.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/download/download-online.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/download/download-portal.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-airgap/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-airgap/install-airgap.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-airgap/install-kots.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-airgap/install-kotsadm.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-airgap/installer-pull-images.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-online/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-online/install-kots.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-online/install-kotsadm.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/install-online/install-online.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/overallResourceAllocation.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/legacy/requirements.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/prerequisites/Infrastructure.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/prerequisites/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/prerequisites/choosing-a-partner.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/_category_.json docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/installation-gcp-terraform.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/installation-trial-cluster.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/installation-trial-embedded.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/installation-trial-kots.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/quick-start-examples-trial-installation/installation-trial-remote.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/run-the-Installation.md docs/launch-platform/self-hosted/installing-on-an-existing-cluster/support-and-troubleshooting.md

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[sourcery-ai]

Hey @robbeverhelst - I've reviewed your changes - here's some feedback:

Overall Comments:

• Could you update the PR description to include a link to the current installation documentation? This will help users who find these old docs through search history.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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