ci: migrate to shared org workflows

Replace content.yml with:
- docs.yml: calls anolishq/.github docs-check
- metrics.yml: calls anolishq/.github metrics

Remove local .markdownlint.json (now fetched from org)

Author: CameronBrooks11

.github/workflows/content.yml

@@ -0,0 +1,20 @@
+name: Docs
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/**'
+      - 'README.md'
+      - 'CONTRIBUTING.md'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'docs/**'
+      - 'README.md'
+      - 'CONTRIBUTING.md'
+  workflow_dispatch:
+
+jobs:
+  check:
+    uses: anolishq/.github/.github/workflows/docs-check.yml@main

.github/workflows/docs.yml

@@ -0,0 +1,12 @@
+name: Metrics
+
+on:
+  push:
+    branches: [main]
+  schedule:
+    - cron: '0 6 * * 1'  # Weekly Monday 6am UTC
+  workflow_dispatch:
+
+jobs:
+  collect:
+    uses: anolishq/.github/.github/workflows/metrics.yml@main