docs: Add Cube Cloud for Excel installation instructions

Author: igorlukanin

docs/pages/product/apis-integrations/microsoft-excel.mdx

@@ -13,12 +13,6 @@ Cube Cloud for Excel is available in Cube Cloud on [Enterprise and above](https:
 
 </SuccessBox>
 
-<WarningBox>
-
-Cube Cloud for Excel is currently in preview. Please [contact us](https://cube.dev/contact) to get access to it.
-
-</WarningBox>
-
 After [configuring](#configuration), [installing](#installation), and
 [authenticating](#authentication) this add-in, you will be able to [create
 reports via pivot table](#create-reports-via-pivot-table) and work with
@@ -36,12 +30,17 @@ Cube Cloud for Excel uses the SQL API internally. So, the SQL API has to be
 
 ## Installation
 
-<WarningBox>
+You have to add this add-in to your Excel application via the <Btn>Add-ins</Btn>
+button. Where this button is located depends on the [Excel version][link-excel-addins].
+For example, in Excel for the web, it's located on the rightmost side of the
+<Btn>Home</Btn> ribbon.
 
-Please contact the customer success team in Cube Cloud so we can guide you
-through the installation.
+Search for `Cube Cloud for Excel (add-in)` and click <Btn>Add</Btn>:
 
-</WarningBox>
+<Screenshot
+  src="https://ucarecdn.com/83ab1e1f-e7d0-4c9c-bea1-f12c193d5e94/"
+  highlight="inset(10.5% 0% 10.5% 40% round 10px)"
+/>
 
 ## Authentication
 
@@ -122,4 +121,5 @@ Click <Btn>Edit</Btn> to chnage the query or the location.
 [ref-playground]: /product/workspace/playground
 [ref-views]: /product/data-modeling/concepts#views
 [ref-pre-aggs]: /product/caching/using-pre-aggregations
-[ref-sql-api-enabled]: /product/apis-integrations/sql-api#cube-cloud
+[ref-sql-api-enabled]: /product/apis-integrations/sql-api#cube-cloud
+[link-excel-addins]: https://support.microsoft.com/en-us/office/add-or-remove-add-ins-in-excel-0af570c4-5cf3-4fa9-9b88-403625a0b460