docs: Consolidate homelab documentation and update SSH guide

operations/dashboard-updates.md

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+# SOP: Updating the Dashboard
+
+The homelab landing page (Antigravity Dashboard) is a static Nginx site managed via Git.
+
+## Workflow
+
+1.  **Local Development:** Modify `index.html` or assets on your local machine.
+2.  **Push Changes:**
+    ```bash
+    git add .
+    git commit -m "Update dashboard: [feature/fix]"
+    git push
+    ```
+3.  **Remote Update:**
+    SSH into the Linode instance and run the pre-configured alias:
+    ```bash
+    updatedash
+    ```
+    *(This is an alias for `/opt/docker/dashboard/update-dash.sh` which performs a `git pull` inside the container's mounted volume).*
+
+## Troubleshooting
+- If the alias fails, manually navigate to the directory:
+  ```bash
+  cd /opt/docker/dashboard && ./update-dash.sh
+  ```