Fleet gitops directory: Add structure

[RachelElysia]

Issue

Part of fleetdm/fleet#29293

Description

• This PR takes all current files in this repo and puts them into subdirectories consistent with: https://github.com/fleetdm/fleet/tree/main/it-and-security
• Removes lib/uninstall-zoom.script.sh as it was 1) empty and 2) is confusing if it's part of a general script or a software's uninstall script
• Does not move /lib/agent-options.yml into /lib/agent-options/agent-options.yml as it's fails gitops CI test moving it