Missing images in some integrations schema section

[jeromefellus-sekoia]

• https://docs.sekoia.io/integration/categories/endpoint/kaspersky_endpoint_security/
• https://docs.sekoia.io/integration/categories/network/dhcpd/
• https://docs.sekoia.io/integration/categories/network/forcepoint_web_gateway/
• https://docs.sekoia.io/integration/categories/network/pulse/
• https://docs.sekoia.io/integration/categories/network_security/fortiproxy/
• https://docs.sekoia.io/integration/categories/network_security/gatewatcher_aioniq/

those pages have broken images (I didn't find images with the same filename elsewhere in the repo so I don't think it's a bad path problem, those images are simply missing)

For now, I'll remove them, but it'd be nice to find other images in replacement

[rombernier]

fix by https://github.com/SEKOIA-IO/documentation/pull/2092