Docusaurus-ify (#26051)

This PR cleans up the docs in a way to make them simpler to ingest by
our [docs repo](https://gitea.com/gitea/gitea-docusaurus).

1. It includes all of the sed invocations our ingestion did, removing
the need to do it at build time.
2. It replaces the shortcode variable replacement method with
`@variable@` style, simply for easier sed invocations when required.
3. It removes unused files and moves the docs up a level as cleanup.

---------

Signed-off-by: jolheiser <john.olheiser@gmail.com>

docs/content/usage/packages/chef.en-us.md

@@ -0,0 +1,93 @@
+---
+date: "2023-01-20T00:00:00+00:00"
+title: "Chef Package Registry"
+slug: "chef"
+sidebar_position: 5
+draft: false
+toc: false
+menu:
+  sidebar:
+    parent: "packages"
+    name: "Chef"
+    sidebar_position: 5
+    identifier: "chef"
+---
+
+# Chef Package Registry
+
+Publish [Chef](https://chef.io/) cookbooks for your user or organization.
+
+## Requirements
+
+To work with the Chef package registry, you have to use [`knife`](https://docs.chef.io/workstation/knife/).
+
+## Authentication
+
+The Chef package registry does not use an username:password authentication but signed requests with a private:public key pair.
+Visit the package owner settings page to create the necessary key pair.
+Only the public key is stored inside Gitea. if you loose access to the private key you must re-generate the key pair.
+[Configure `knife`](https://docs.chef.io/workstation/knife_setup/) to use the downloaded private key with your Gitea username as `client_name`.
+
+## Configure the package registry
+
+To [configure `knife`](https://docs.chef.io/workstation/knife_setup/) to use the Gitea package registry add the url to the `~/.chef/config.rb` file.
+
+```
+knife[:supermarket_site] = 'https://gitea.example.com/api/packages/{owner}/chef'
+```
+
+| Parameter | Description |
+| --------- | ----------- |
+| `owner`   | The owner of the package. |
+
+## Publish a package
+
+To publish a Chef package execute the following command:
+
+```shell
+knife supermarket share {package_name}
+```
+
+| Parameter      | Description |
+| -------------- | ----------- |
+| `package_name` | The package name. |
+
+You cannot publish a package if a package of the same name and version already exists. You must delete the existing package first.
+
+## Install a package
+
+To install a package from the package registry, execute the following command:
+
+```shell
+knife supermarket install {package_name}
+```
+
+Optional you can specify the package version:
+
+```shell
+knife supermarket install {package_name} {package_version}
+```
+
+| Parameter         | Description |
+| ----------------- | ----------- |
+| `package_name`    | The package name. |
+| `package_version` | The package version. |
+
+## Delete a package
+
+If you want to remove a package from the registry, execute the following command:
+
+```shell
+knife supermarket unshare {package_name}
+```
+
+Optional you can specify the package version:
+
+```shell
+knife supermarket unshare {package_name}/versions/{package_version}
+```
+
+| Parameter         | Description |
+| ----------------- | ----------- |
+| `package_name`    | The package name. |
+| `package_version` | The package version. |