Remove "Was this page helpful?" form

[danoc]

Unfortunately the form itself was not very helpful due to the amount of spam responses it received.

We can investigate adding this back someday if we can gate it to only employees.

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[egoens]

@danoc I just noticed this form is still present on a few pages.

Examples:

• https://thumbprint.design/components/action-sheet/ios/
• https://thumbprint.design/help/
• https://thumbprint.design/updates/notes/