refactor: extract userbot to standalone repo, add as git submodule

userbot now lives at ssh://git@gitssh.forust.xyz:2221/forust/userbot.git
and is included in homelab as a submodule at userbot/

userbot/k8s/base/kustomization.yaml

@@ -1,9 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-resources:
-  - userbots.yaml
-  - common-secret.yaml
-  - common-config.yaml
-  - forust-secrets.yaml
-  - anna-secrets.yaml