[API Shield] FAQ to docs

[patriciasantaana]

Summary

Removes FAQ page to integrate into body

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/public/__redirects	@GregBrimble, @KianNH, @pedrosousa, @WalshyDev, @cloudflare/pcx-technical-writing
/src/content/docs/api-shield/	@patriciasantaana, @cloudflare/pcx-technical-writing

[github-actions]

This PR requires additional review attention because it affects the following areas:

Redirects

This PR changes current filenames or deletes current files. Make sure you have redirects set up to cover the following paths:

• /api-shield/frequently-asked-questions/

[github-actions]

Preview URL: https://80239a6a.preview.developers.cloudflare.com
Preview Branch URL: https://patricia-pcx19526-apishi.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/api-shield/frequently-asked-questions/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/frequently-asked-questions/
https://developers.cloudflare.com/api-shield/security/volumetric-abuse-detection/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/security/volumetric-abuse-detection/
https://developers.cloudflare.com/api-shield/management-and-monitoring/endpoint-management/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/management-and-monitoring/endpoint-management/
https://developers.cloudflare.com/api-shield/security/api-discovery/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/security/api-discovery/
https://developers.cloudflare.com/api-shield/security/schema-validation/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/security/schema-validation/
https://developers.cloudflare.com/api-shield/	https://patricia-pcx19526-apishi.preview.developers.cloudflare.com/api-shield/