docs: Add CUBEJS_DAX_CREATE_DATE_HIERARCHIES env var

Author: igorlukanin

docs/pages/product/apis-integrations/dax-api.mdx

@@ -43,6 +43,10 @@ To enable or disable the DAX API on a specific deployment, go to <Btn>Settings</
 in the Cube Cloud sidebar, then <Btn>Configuration</Btn>, and then toggle the
 <Btn>Enable DAX API</Btn> option.
 
+By default, the DAX API exposes all [time dimensions][ref-time-dimensions] as calendar
+hierarchies. You can set the `CUBEJS_DAX_CREATE_DATE_HIERARCHIES` environment
+variable to `false` to disable this behavior.
+
 ## Authentication
 
 The DAX API supports the user name and password authentication method.
@@ -55,12 +59,6 @@ The DAX API works only with [views][ref-views], not cubes.
 
 </InfoBox>
 
-{/*
-
-TODO
-
-*/}
-
 ### Connection methods
 
 Power BI provides [three methods][link-powerbi-connection] to connect to data
@@ -84,4 +82,5 @@ it removes the benefits of using a semantic layer.
 [ref-sql-api]: /product/apis-integrations/sql-api
 [ref-ref-dax-api]: /product/apis-integrations/dax-api/reference
 [ref-views]: /product/data-modeling/concepts#views
-[link-powerbi-connection]: https://learn.microsoft.com/en-us/power-bi/connect-data/service-live-connect-dq-datasets
+[link-powerbi-connection]: https://learn.microsoft.com/en-us/power-bi/connect-data/service-live-connect-dq-datasets
+[ref-time-dimensions]: /product/data-modeling/concepts#time-dimensions

docs/pages/reference/configuration/environment-variables.mdx

@@ -1210,6 +1210,14 @@ Number of seconds before session's SQL API security context will be invalidated.
 | --------------- | ---------------------- | --------------------- |
 | A valid integer number | `300`                 | `300`                |
 
+## `CUBEJS_DAX_CREATE_DATE_HIERARCHIES`
+
+If `true`, the DAX API will expose time dimensions as calendar hierarchies.
+
+| Possible Values | Default in Development | Default in Production |
+| --------------- | ---------------------- | --------------------- |
+| `true`, `false` | `true` | `true` |
+
 ## `CUBEJS_TELEMETRY`
 
 If `true`, then send telemetry to Cube.