Remove kernel page and redirect to install page

[mattwojo]

No description provided.

[opbld30]

Docs Build status updates of commit 11ac807:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
.openpublishing.redirection.json	⚠️Warning		Details
WSL/wsl2-kernel.md	✅Succeeded

.openpublishing.redirection.json

• Line 45, Column 87: [Warning-redirection-url-conflict] The 'install-win10#step-4---download-the-linux-kernel-update-package' appears twice or more in the redirection mappings.

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