chore: add Backstage catalog-info.yaml

catalog-info.yaml

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+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: hookla
+  description: Hookla webhook delivery service.
+  annotations:
+    github.com/project-slug: widgetbot-io/hookla
+    backstage.io/techdocs-ref: dir:.
+    backstage.io/kubernetes-id: hookla
+  links:
+    - url: https://github.com/widgetbot-io/hookla
+      title: Source
+      icon: github
+  tags:
+    - side-projects
+spec:
+  type: service
+  lifecycle: production
+  owner: group:side-projects
+  system: side-projects

docs/index.md

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+# hookla
+
+Hookla webhook delivery service.
+
+> This file is a Backstage TechDocs stub. Replace with real architecture / runbook content as you have time. Backstage will render this directory as the component documentation tab.
+
+## Quick links
+
+- [Source on GitHub](https://github.com/widgetbot-io/hookla)
+- Owner: `group:side-projects`
+- System: `side-projects`
+
+## Where it runs
+
+See the Kubernetes tab for live instances. The K8s plugin queries every configured cluster for workloads labelled `backstage.io/kubernetes-id: hookla`.

mkdocs.yml

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+site_name: hookla
+docs_dir: docs
+plugins:
+  - techdocs-core