docs: add truenas integration

docs/integrations/truenas/index.mdx

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+---
+title: 'TrueNAS'
+description: "Enterprise network-attached storage for your home, office, and cloud."
+hide_title: true
+---
+
+import { IntegrationHeader } from '@site/src/components/integrations/header';
+import { IntegrationCapabilites } from '@site/src/components/integrations/widgets';
+import { AddingIntegration } from '@site/src/components/integrations/adding';
+import { IntegrationSecrets } from '@site/src/components/integrations/secrets';
+import { truenasIntegration } from '.';
+import { systemResourcesWidget } from '@site/docs/widgets/system-resources';
+
+
+<IntegrationHeader
+  integration={truenasIntegration}
+  categories={['NAS', 'Hardware']}
+/>
+
+### Widgets & Capabilities
+<IntegrationCapabilites
+    items={[{ widget: systemResourcesWidget }]}
+/>
+
+### Adding the integration
+<AddingIntegration />
+
+### Secrets
+<IntegrationSecrets secrets={[{
+    credentials: ['username', 'password'],
+    steps: [
+      "Create a user on the TrueNAS UI with a secure password at \"Credentials\" > \"Users\" > \"Add User\".",
+      "Add the auxiliary group \"auxiliary_administrator\" to the user.",
+      "Save the user and create an integration in Homarr with the previous defined credentials"
+    ],
+}]} />

docs/integrations/truenas/index.ts

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+import { IntegrationDefinition } from '@site/src/types';
+export const truenasIntegration: IntegrationDefinition = {
+  name: 'TrueNAS',
+  description: 'Enterprise network-attached storage for your home, office, and cloud.',
+  iconUrl: 'https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/svg/truenas.svg',
+  path: '../../integrations/truenas',
+};