Fix install docs and archive URL to use GitHub (from QA review)

- Restore install as multi-line Markdown guide (was replaced by url/digest object)
- Point annotations.archive-url to github.com instead of git.farh.net

artifacthub-pkg.yml

@@ -23,9 +23,30 @@ links:
   url: https://github.com/privilegedescalation/headlamp-polaris-plugin
 - name: Polaris
   url: https://polaris.docs.fairwinds.com/
-install:
-  url: https://git.farh.net/privilegedescalation/headlamp-polaris-plugin/releases/download/v1.0.1/headlamp-polaris-1.0.1.tar.gz
-  digest: sha256:1e05d079c7032cf55ebde85e116cb65b686d207f4b6a3b0f716f0af93f933e7e
+install: |
+  ## Installation
+
+  ### Prerequisites
+
+  1. [Headlamp](https://headlamp.dev) v0.26.0 or later
+  2. [Fairwinds Polaris](https://polaris.docs.fairwinds.com/) installed and the dashboard running in your cluster
+
+  ### Install via Headlamp Plugin Catalog
+
+  1. Open Headlamp and navigate to **Settings → Plugin Catalog**
+  2. Search for **"Polaris"**
+  3. Click **Install** and restart Headlamp when prompted
+
+  The plugin is sourced directly from [ArtifactHub](https://artifacthub.io/packages/headlamp/headlamp/headlamp-polaris).
+
+  ## Usage
+
+  After installation, the Polaris plugin adds:
+  - A **cluster score badge** in the Headlamp app bar
+  - A **Polaris** section in the sidebar with the full dashboard and namespace drill-downs
+  - An **inline audit panel** on Deployment, StatefulSet, DaemonSet, Job, and CronJob detail pages
+
+  For more information, see the [README](https://github.com/privilegedescalation/headlamp-polaris-plugin/blob/main/README.md).
 changes:
 - kind: security
   description: Patched 8 npm audit vulnerabilities via pnpm.overrides
@@ -54,7 +75,7 @@ maintainers:
 - name: privilegedescalation
   email: chris@farhood.org
 annotations:
-  headlamp/plugin/archive-url: https://git.farh.net/privilegedescalation/headlamp-polaris-plugin/releases/download/v1.0.1/headlamp-polaris-1.0.1.tar.gz
+  headlamp/plugin/archive-url: https://github.com/privilegedescalation/headlamp-polaris-plugin/releases/download/v1.0.1/headlamp-polaris-1.0.1.tar.gz
   headlamp/plugin/version-compat: '>=0.26'
   headlamp/plugin/archive-checksum: sha256:1e05d079c7032cf55ebde85e116cb65b686d207f4b6a3b0f716f0af93f933e7e
   headlamp/plugin/distro-compat: in-cluster,web,desktop