Revert "Implement key pair resource (#578)" (#581)

This reverts commit 153947f.

Author: joaopalet

docs/data-sources/key_pair.md

@@ -3,13 +3,13 @@
 page_title: "stackit_public_ip Data Source - stackit"
 subcategory: ""
 description: |-
-  Public IP resource schema. Must have a region specified in the provider configuration.
+  Volume resource schema. Must have a region specified in the provider configuration.
   ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
 ---
 
 # stackit_public_ip (Data Source)
 
-Public IP resource schema. Must have a `region` specified in the provider configuration.
+Volume resource schema. Must have a `region` specified in the provider configuration.
 
 ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.