* Refresh existing docs images.
* Add tls-related images.
* Add certificates page to docs.
* Update settings page with explanation of cert threshold fields.
* Add placeholder image of updated settings page. Will need finalized version of this after we merge updated defaults for age limit threshold.
* Add new alerting docs page.
* Refresh settings page image.
* Implement feedback and re-write/simplify some sections.
* Clean up words.
* Implement feedback on sentence structure.
* Improve copy on alerting page.
* Improve copy on settings page.
* Update layout on alerting page.
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
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