adding custom materialization link (#4557)

[per slack
thread](https://dbt-labs.slack.com/archives/C02NCQ9483C/p1701341336153579),
adding a linnk to the materializataion guide and also removing the
'core' label to that guide since it's applicable to core and cloud
users.

website/docs/docs/build/materializations.md

@@ -14,6 +14,8 @@ pagination_next: "docs/build/incremental-models"
 - ephemeral
 - materialized view
 
+You can also configure [custom materializations](/guides/create-new-materializations?step=1) in dbt. Custom materializations are a powerful way to extend dbt's functionality to meet your specific needs. 
+
 
 ## Configuring materializations
 By default, dbt models are materialized as "views". Models can be configured with a different materialization by supplying the `materialized` configuration parameter as shown below.

website/docs/guides/create-new-materializations.md

@@ -7,7 +7,6 @@ hoverSnippet: Learn how to create your own materializations.
 # time_to_complete: '30 minutes' commenting out until we test
 icon: 'guides'
 hide_table_of_contents: true
-tags: ['dbt Core']
 level: 'Advanced'
 recently_updated: true
 ---