add new 'Compare to' section under ESC in docs

[shughes26]

Proposed changes

Added new Compare to directory under ESC in docs, and page for ESC vs Vault https://github.com/pulumi/marketing/issues/1060

[pulumi-bot]

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[arunkumar611]

We should change the get started here at the bottom of the page. It is talking about IaC:

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