Move documentation for workflows to separate files

docs/admin_guide/index.md

docs/admin_guide/oss_bss/ipam.md

docs/admin_guide/oss_bss/kentik.md

docs/admin_guide/oss_bss/librenms.md

docs/admin_guide/oss_bss/netbox.md

docs/admin_guide/wfo/iptrunks.md

docs/admin_guide/wfo/overview.md

docs/admin_guide/wfo/routers.md

docs/admin_guide/wfo/sites.md

docs/admin_guide/wfo/wfo.md

docs/index.md

docs/legacy_platform/new_router_deployment.md

docs/legacy_platform/overview.md

docs/user_guide/index.md

docs/user_guide/iptrunks/index.md

docs/user_guide/routers/deploy_router.md

docs/user_guide/routers/index.md

docs/user_guide/sites/index.md

docs/user_guide/sites/node_provisioning.md

docs/workflow/activate_iptrunk.md