add examples to docs site

docs/content/examples/helm/_index.md

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+To define a helm release, use the {{< option "kubernetes.helm.releases" >}} option.
+
+{{< source "default.nix" >}}
+
+Fetch and render the chart just as we did with plain manifests:
+
+```sh
+nix eval -f . --json config.kubernetes.generated
+```

docs/content/examples/helm/default.nix

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+{kubenix ? import ../../../..}:
+kubenix.evalModules.${builtins.currentSystem} {
+  module = {kubenix, ...}: {
+    imports = with kubenix.modules; [helm];
+    kubernetes.helm.releases.example = {
+      chart = kubenix.lib.helm.fetch {
+        chart = "nginx";
+        repo = "https://charts.bitnami.com/bitnami";
+        sha256 = "sha256-wP3tcBnySx+kvZqfW2W9k665oi8KOI50tCcAl0g9cuw=";
+      };
+      values = {
+        replicaCount = 2;
+      };
+    };
+  };
+}