Remove Flux CLI docs

Makefile

docs/cmd/flux.md

docs/cmd/flux_bootstrap.md

docs/cmd/flux_bootstrap_git.md

docs/cmd/flux_bootstrap_github.md

docs/cmd/flux_bootstrap_gitlab.md

docs/cmd/flux_check.md

docs/cmd/flux_completion.md

docs/cmd/flux_completion_bash.md

docs/cmd/flux_completion_fish.md

docs/cmd/flux_completion_powershell.md

docs/cmd/flux_completion_zsh.md

docs/cmd/flux_create.md

docs/cmd/flux_create_alert-provider.md

docs/cmd/flux_create_alert.md

docs/cmd/flux_create_helmrelease.md

docs/cmd/flux_create_image.md

docs/cmd/flux_create_image_policy.md

docs/cmd/flux_create_image_repository.md

docs/cmd/flux_create_image_update.md