Add Manage your license page (#539)

[Preview](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/539/deploy-manage/license)

- Add basic landing page w/ links and resources
- Add nav titles and other essentials for individual pages 
- Adjust order in TOC to match Deploy & manage > Deploy 

Closes elastic/docs-projects#303

---------

Co-authored-by: shainaraskas <58563081+shainaraskas@users.noreply.github.com>

Author: marciw

deploy-manage/cloud-organization/billing/manage-subscription.md

@@ -3,6 +3,7 @@ mapped_urls:
   - https://www.elastic.co/guide/en/serverless/current/general-check-subscription.html
   - https://www.elastic.co/guide/en/cloud/current/ec-subscription-overview.html
   - https://www.elastic.co/guide/en/cloud/current/ec-select-subscription-level.html
+  - https://www.elastic.co/guide/en/cloud/current/ec-licensing.html
 applies_to:
   deployment:
     ess: all

deploy-manage/license.md

@@ -1,11 +1,35 @@
 ---
-mapped_pages:
-  - https://www.elastic.co/guide/en/cloud/current/ec-licensing.html
+applies_to:
+  deployment:
+    ece:
+    ech:
+    ess:
+    self:
+  serverless:
 ---
 
-# Manage your license [ec-licensing]
+# Manage your license  
 
-For more information on what is available with different subscription levels, check [Elasticsearch Service Subscriptions](https://www.elastic.co/elasticsearch/service/pricing). You are entitled to use all of the features in Elasticsearch Service that match your subscription level. Please use them to your heart’s content.
+Your Elastic license determines which features are available and what level of support you receive. 
 
-Your subscription determines [which features are available](https://www.elastic.co/subscriptions/cloud). For example, machine learning requires a Platinum or Private subscription and is not available if you upgrade to a Gold subscription. Similarly, SAML Single Sign-On requires an Enterprise subscription.
+Depending on your deployment type, licenses and subscriptions are applied at different levels:
 
+* **{{ecloud}}, {{ece}}, and {{eck}}:** Licenses and subscriptions are controlled at the orchestrator or organization level, and apply to all related deployments.
+* **Self-managed {{es}}:** Licenses are controlled at the cluster level, and apply only to a single cluster.
+
+For a comprehensive comparison of the available subscription levels, see [Elastic subscriptions](https://www.elastic.co/subscriptions).
+
+Use the topics in this section to manage your license or start a trial:  
+
+- [{{ecloud}}](/deploy-manage/cloud-organization/billing/manage-subscription.md): Applies to both {{ech}} deployments and {{serverless-full}} projects in your Cloud organization
+- [{{ece}}](/deploy-manage/license/manage-your-license-in-ece.md)  
+- [{{eck}}](/deploy-manage/license/manage-your-license-in-eck.md)  
+- [Self-managed cluster](/deploy-manage/license/manage-your-license-in-self-managed-cluster.md)  
+
+## Additional resources  
+
+Explore these resources for details on subscriptions and features:
+
+- [{{stack}} subscriptions](https://www.elastic.co/subscriptions)  
+- [{{ecloud}} features](https://www.elastic.co/subscriptions/cloud)  
+- [{{ecloud}} pricing](https://www.elastic.co/pricing)  

deploy-manage/license/manage-your-license-in-ece.md

@@ -1,9 +1,12 @@
 ---
+navigation_title: "{{ece}}"
+applies_to:
+  ece: 
 mapped_pages:
   - https://www.elastic.co/guide/en/cloud-enterprise/current/ece-add-license.html
 ---
 
-# Manage your license in ECE [ece-add-license]
+# Manage your license in {{ece}} [ece-add-license]
 
 The use of Elastic Cloud Enterprise requires a valid license, which you can obtain from Elastic and add to your installation following the steps described in this document. When you first install ECE we automatically activate ECE with a trial license that is valid for 30 days.
 

deploy-manage/license/manage-your-license-in-eck.md

@@ -1,12 +1,13 @@
 ---
+navigation_title: "{{eck}}"
 applies_to:
   deployment:
     eck: all
 mapped_pages:
   - https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-licensing.html
 ---
 
-# Manage your license in ECK [k8s-licensing]
+# Manage your license in {{eck}} [k8s-licensing]
 
 When you install the default distribution of ECK, you receive a Basic license. Any Elastic stack application you manage through ECK will also be Basic licensed. Go to [https://www.elastic.co/subscriptions](https://www.elastic.co/subscriptions) to check which features are included in the Basic license for free.
 

deploy-manage/license/manage-your-license-in-self-managed-cluster.md

@@ -1,13 +1,16 @@
 ---
+navigation_title: "Self-managed cluster"
+applies_to:
+  self:
 mapped_pages:
   - https://www.elastic.co/guide/en/kibana/current/managing-licenses.html
 ---
 
-# Manage your license in self-managed cluster [managing-licenses]
+# Manage your license in a self-managed cluster [managing-licenses]
 
-By default, new installations have a Basic license that never expires. For the full list of features available at the Free and Open Basic subscription level, refer to {{subscriptions}}.
+By default, new installations have a Basic license that never expires. For the full list of features available at the Free and Open Basic subscription level, refer to [Elastic subscriptions](https://www.elastic.co/subscriptions).
 
-To explore all of the available solutions and features, start a 30-day free trial. You can activate a trial subscription once per major product version. If you need more than 30 days to complete your evaluation, request an extended trial at {{extendtrial}}.
+To explore all of the available solutions and features, start a 30-day free trial. You can activate a trial subscription once per major product version. If you need more than 30 days to complete your evaluation, [request an extended trial](https://www.elastic.co/trialextension).
 
 To view the status of your license, start a trial, or install a new license, go to the **License Management** page using the navigation menu or the [global search field](../../explore-analyze/find-and-organize/find-apps-and-objects.md).
 

deploy-manage/toc.yml

@@ -790,8 +790,8 @@ toc:
       - file: cloud-organization/tools-and-apis.md
   - file: license.md
     children:
-      - file: license/manage-your-license-in-eck.md
       - file: license/manage-your-license-in-ece.md
+      - file: license/manage-your-license-in-eck.md
       - file: license/manage-your-license-in-self-managed-cluster.md
   - file: maintenance.md
     children: