reg-delete: add page

pages/windows/reg-delete.md

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+# reg delete
+
+> Delete keys or their values from the registry.
+
+- Delete a specific registry key:
+
+`reg delete {{key_name}}`
+
+- Delete a value under a specific key:
+
+`reg delete {{key_name}} /v {{value}}`
+
+- Delete all values recursively under the specified key:
+
+`reg delete {{key_name}} /va`
+
+- Forcefully deletes the key or value without a prompt:
+
+`reg delete {{key_name}} /f`