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/overlays/prod/kustomization.yaml

@@ -1,8 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-resources:
-  - ../../base
-
-patches:
-  - path: patch-downloads.yaml

userbot/k8s/overlays/prod/patch-downloads.yaml

@@ -1,35 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: forust-userbot-deployment
-spec:
-  template:
-    spec:
-      containers:
-        - name: forust-userbot
-          volumeMounts:
-            - name: downloads
-              mountPath: /app/downloads
-      volumes:
-        - name: downloads
-          hostPath:
-            path: /srv/homelab/userbot/Downloads
-            type: DirectoryOrCreate
----
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: anna-userbot-deployment
-spec:
-  template:
-    spec:
-      containers:
-        - name: anna-userbot
-          volumeMounts:
-            - name: downloads
-              mountPath: /app/downloads
-      volumes:
-        - name: downloads
-          hostPath:
-            path: /srv/homelab/userbot/Downloads
-            type: DirectoryOrCreate