Add Enterprise Portal documentation (#1254)

Adds customer facing docs for Enterprise Portal detailing what the
service is, how to access it, and what services are currently available
through it.

Closes CORE-1147
Closes CORE-1087

Author: jac

README.md

@@ -25,10 +25,10 @@ Before the dependencies are installed make sure your local machine has the follo
 * node: `v20.8.1`
 * pnpm: `8.13.1`
 
-**Note**: If you have `asdf` available you can install the above versions for only this repository by running the following command from your terminal in the root folder:
+**Note**: If you have `mise` available you can install the above versions for only this repository by running the following command from your terminal in the root folder:
 
 ```sh
-asdf install
+mise install
 ```
 
 Now that the base requirements of the project have been satisfied, we can install the required dependencies to run the development server!

docs/enterprise-portal/index.mdx

@@ -0,0 +1,31 @@
+# Sourcegraph Enterprise Portal
+
+Sourcegraph Enterprise Portal is a tool for viewing your enterprise subscription and managing user access to Sourcegraph operated services.
+
+<QuickLinks>
+    <QuickLink title="Sourcegraph Enterprise Portal" href="https://enterprise-portal.sourcegraph.com" description="Open Enterprise Portal" icon='theming'/>
+</QuickLinks>
+
+## Accessing Sourcegraph Enterprise Portal
+
+A [Sourcegraph Account](/sourcegraph-accounts) is required to access Sourcegraph Enterprise Portal. To manage a subscription a user must be added as a **Subscription admin** for the subscription.
+
+![Sourcegraph Enterprise Portal subscription](https://storage.googleapis.com/sourcegraph-assets/Docs/enterprise-portal-manage.png)
+
+
+## Subscription admin management
+
+A subscription admin is a user with full access to the subscription in Enterprise Portal. Subscription admins can grant and revoke admin access to other users.
+
+![Sourcegraph Enterprise Portal admin management](https://storage.googleapis.com/sourcegraph-assets/Docs/enterprise-portal-admins.png)
+
+Users can be invited individually or in bulk. If there is no [Sourcegraph Account](/sourcegraph-accounts) associated with an invited user's email address an account will be created for them. Newly created users are sent an email with instructions to reset their password to access Enterprise Portal.
+
+
+## Services
+
+### Sourcegraph Analytics access
+
+Subscription admins can view [Sourcegraph Analytics](/analytics) for the subscription.
+
+![Sourcegraph Enterprise Portal analytics](https://storage.googleapis.com/sourcegraph-assets/Docs/enterprise-portal-analytics.png)

src/data/navigation.ts

@@ -498,6 +498,10 @@ export const navigation: NavigationItem[] = [
 					}
 				]
 			},
+			{
+				title: 'Sourcegraph Enterprise Portal',
+				href: '/enterprise-portal'
+			},
 			{
 				title: 'Sourcegraph Cloud',
 				href: '/cloud'