feat: initial account experience docs (#1526)

* feat: initial account experience docs

* chore: address review feedback

docs/account-experience/index.mdx

@@ -0,0 +1,31 @@
+---
+id: index
+title: Account-Experience Overview
+sidebar_label: Account-Experience
+---
+
+The Ory Account Experience is the default user interface for all self-service screens like login, registration, or consent. It can
+be accessed under `https://your-slug.projects.oryapis.com/ui`. New Ory Network projects are automatically configured to use the
+Account Experience. You can find various customizations and settings in the Ory Console under `Account Experience`.
+
+## Theming
+
+The Account Experience can be themed using the Ory Console. Head over to the
+[theming settings](https://console.ory.sh/projects/current/account-experience/theming). It is also possible to set a custom logo
+and favicon.
+
+## Welcome Screen
+
+The Account Experience comes with a welcome screen that shows information about the current user's session. As this screen is
+rather meant for debugging purposes, it can be disabled in the [Ory Console](https://console.ory.sh/projects/current/ui).
+
+## Translations (i18n) & Message Customization
+
+Currently, the account experience is available in English (fallback), Spanish, and German. If you want to add a new language or
+fix some wording, please open a pull request in [ory/elements](https://github.com/ory/elements#internalization-i18n). To determine
+the language to use, the Account Experience uses the `Accept-Language` header. If the language is not available, the fallback
+language (English) is used. Custom translations are not supported at the moment, but please reach out if you need this feature.
+
+## Custom Domains
+
+The Account Experience is also available under custom domains the same way it works on the slug URL.

src/sidebar.js

@@ -282,6 +282,7 @@ module.exports = {
         },
       ],
     },
+    "account-experience/index",
     {
       type: "category",
       label: "Ory CLI",