docs: Add prerequisites, new installation instructions (marketplace)

website/docs/integrations/jira-server-plugin-installation.md

@@ -10,49 +10,35 @@ existing toggles to Jira issues.
 
 The plugin also shows you current status of connected toggles.
 
-## Required access levels
-
-### Unleash
-
-You will need an Unleash admin to configure an admin API token.
+## Prerequisites
 
 ### Jira
 
-You will need a Jira admin user.
-
-## Installation
-
-The Jira server plugin is currently not listed on the Atlassian marketplace.
-
-To get access to the Jira plugin, please reach out to sales@getunleash.io.
+- [Jira **data center**](https://www.atlassian.com/enterprise/data-center/jira), v8.0 or higher
 
-You will receive a dedicated link that will allow you to download the Unleash Jira server plugin.
+We do not support Jira Cloud at the moment.
 
-Once you've downloaded the plugin artifact, you'll need to click the Manage Apps link in Jira's administration menu
-
-![Jira Manage Apps](/img/jira_server_manage_apps.png)
-
-This will take you to Atlassian's marketplace for Jira apps.
+### Unleash
 
-From here, click the "Manage apps" link in the left-hand menu
+- Unleash v4 or higher
+- Unleash Pro or Unleash Enterprise license
 
-![Jira Marketplace - Manage apps](/img/jira_marketplace_manage_apps.png)
+## Required access levels
 
-Now, click "Upload app"
+### Unleash
 
-![Jira Manage Apps - Upload App](/img/jira_upload_app.png)
+You will need an Unleash admin to configure an admin API token.
 
-This will prompt you to select the plugin artifact for upload.
+### Jira
 
-![Jira Manage Apps - Browse](/img/jira_upload_app_dialog.png)
+You will need a Jira admin user.
 
-Once you've selected your file and clicked "Upload". Jira will install the plugin, and you should get a nice status screen saying that it successfully installed.
+## Installation
 
-![Jira Manage Apps - Successful install](/img/jira_server_installed_ready_to_go.png)
+The [Jira server plugin is available in the Atlassian marketplace](https://marketplace.atlassian.com/apps/1227377/unleash-for-jira?tab=overview&hosting=datacenter).
 
-You can now move on to [Configuring the plugin](#configure-plugin)
 
-## Configuring plugin {#configure-plugin}
+## Configuring the plugin {#configure-plugin}
 
 After the plugin is installed. Jira's Manage Apps page will have a new menu section called "Unleash Admin" with a single
 link - "Configure servers".