[8.17] [serverless][ESS][bugfix] Fixes outdated image on env var capture page (backport #6298) (#6316)

* removes outdated pic (#6298)

(cherry picked from commit b5e6d2e)

# Conflicts:
#	docs/serverless/cloud-native-security/environment-variable-capture.asciidoc

* Delete docs/serverless directory and its contents

---------

Co-authored-by: Benjamin Ironside Goldstein <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

docs/cloud-native-security/environment-variable-capture.asciidoc

@@ -28,9 +28,6 @@ To set up environment variable capture for an {agent} policy:
 . Enter the names of env vars you want to capture, separated by commas. For example: `PATH,USER`
 . Click *Save*.
 
-[role="screenshot"]
-image::images/env-var-capture.png[The "linux.advanced.capture_env_vars" advanced agent policy setting]
-
 [[find-cap-env-vars]]
 [discrete]
 == Find captured environment variables