docs: add krew install to CLI reference and installation guide

The kubectl-attune plugin is available via Krew since PR kubernetes-sigs/krew-index#5788 was merged. Add krew as the recommended install
method in both the CLI reference and the getting-started installation
page, and add a kubectl plugin section to the installation guide.

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>

Author: SebTardif

docs/getting-started/installation.md

@@ -106,6 +106,21 @@ attunenamespacedefaults.attune.io    2026-01-15T00:00:00Z
 attunepolicies.attune.io             2026-01-15T00:00:00Z
 ```
 
+## kubectl plugin (optional)
+
+The `kubectl attune` plugin provides quick access to recommendations,
+savings estimates, and resize history.
+
+```bash
+# Install via Krew (recommended)
+kubectl krew install attune
+
+# Or build from source
+make build-plugin && sudo cp bin/kubectl-attune /usr/local/bin/
+```
+
+See the [CLI Reference](../reference/cli.md) for available commands.
+
 ## Next steps
 
 Head to the [Quick Start](quickstart.md) to create your first AttunePolicy.

docs/reference/cli.md

@@ -5,15 +5,12 @@ reasoning.
 ## Installation
 
 ```bash
-# Build from source
-make build-plugin
+# Install via Krew (recommended)
+kubectl krew install attune
 
-# Copy to your PATH (system-wide)
+# Or build from source
+make build-plugin
 sudo cp bin/kubectl-attune /usr/local/bin/
-
-# Or install for the current user only
-install -Dm755 bin/kubectl-attune "$HOME/.local/bin/kubectl-attune"
-export PATH="$HOME/.local/bin:$PATH"
 ```
 
 ## Commands

lychee.toml

@@ -5,6 +5,7 @@ exclude = [
   "example\\.com",
   "medium\\.com",
   "hub\\.docker\\.com",
+  "securityscorecards\\.dev",
 ]
 exclude_loopback = true
 max_concurrency = 8