chainctl: add page (#17218)

* Create chainctl.md

Add handy tldr entry for Chainguard's CLI tool

* shortening to 8 entries

* Update pages/common/chainctl.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/common/chainctl.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update chainctl.md spelling fix

* Update pages/common/chainctl.md

Co-authored-by: Machiavelli <145562237+MachiavelliII@users.noreply.github.com>

* Update pages/common/chainctl.md

Co-authored-by: Machiavelli <145562237+MachiavelliII@users.noreply.github.com>

* Update pages/common/chainctl.md

Fair enough. Begone UPPERCASE. :)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

---------

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Machiavelli <145562237+MachiavelliII@users.noreply.github.com>

pages/common/chainctl.md

@@ -0,0 +1,36 @@
+# chainctl
+
+> The official CLI for Chainguard.
+> More information: <https://edu.chainguard.dev/chainguard/chainctl>.
+
+- Authenticate to the Chainguard Platform:
+
+`chainctl auth login`
+
+- Logout from the Chainguard Platform:
+
+`chainctl auth logout`
+
+- Check which version you have installed:
+
+`chainctl version`
+
+- Update to the latest version:
+
+`chainctl update`
+
+- List images available to your account:
+
+`chainctl images list`
+
+- List image repositories available to your account:
+
+`chainctl images repos list`
+
+- Examine the history of an image tag in chainctl (e.g., image=python tag=3):
+
+`chainctl images history {{image}}:{{tag}}`
+
+- List package version data from repositories available to your account (e.g., package_name=go):
+
+`chainctl packages versions list {{package_name}}`