Fix yaml key and bare-metal index

[hjiawei]

This change fixes the certificate-authority-data key for kubeconfig in the bare-metal doc. It also revert the index.mdx changes from [1].

[1] https://github.com/tigera/docs/pull/1758/files#diff-cee12842f2d30c31655cc9f7e40e9b74e3e89c147e8568e7023c6a298cca6fe3

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[ctauchen]

LGTM, thanks for the fixes