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

This reverts commit 3c383db9a7.

userbot/k8s/base/kustomization.yaml

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