docs: restructure docs (#14421)

Closes #13434 
Supersedes #14182

---------

Co-authored-by: Ethan <39577870+ethanndickson@users.noreply.github.com>
Co-authored-by: Ethan Dickson <ethan@coder.com>
Co-authored-by: Ben Potter <ben@coder.com>
Co-authored-by: Stephen Kirby <58410745+stirby@users.noreply.github.com>
Co-authored-by: Stephen Kirby <me@skirby.dev>
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>

docs/admin/licensing/index.md

@@ -0,0 +1,47 @@
+# Licensing
+
+Some features are only accessible with a Premium or Enterprise license. See our
+[pricing page](https://coder.com/pricing) for more details. To try Premium
+features, you can [request a trial](https://coder.com/trial) or
+[contact sales](https://coder.com/contact).
+
+<!-- markdown-link-check-disable -->
+
+> If you are an existing customer, you can learn more our new Premium plan in
+> the [Coder v2.16 blog post](https://coder.com/blog/release-recap-2-16-0)
+
+<!-- markdown-link-check-enable -->
+
+## Adding your license key
+
+There are two ways to add a license to a Coder deployment:
+
+<div class="tabs">
+
+### Coder UI
+
+First, ensure you have a license key
+([request a trial](https://coder.com/trial)).
+
+With an `Owner` account, navigate to `Deployment -> Licenses`, `Add a license`
+then drag or select the license file with the `jwt` extension.
+
+![Add License UI](../../images/add-license-ui.png)
+
+### Coder CLI
+
+First, ensure you have a license key
+([request a trial](https://coder.com/trial)) and the
+[Coder CLI](../../install/cli.md) installed.
+
+1. Save your license key to disk and make note of the path
+2. Open a terminal
+3. Ensure you are logged into your Coder deployment
+
+   `coder login <access url>`
+
+4. Run
+
+   `coder licenses add -f <path to your license key>`
+
+</div>