feat: ✨ controlled variable page

docs/controlled-variables.mdx

@@ -0,0 +1,17 @@
+---
+sidebar_position: 5
+title: Controlled Variables
+---
+
+**The following variables are not in the published dataset and require Data Access Committee approval and a Data Use Agreement before they can be accessed:**
+ - 5-digit zip code
+ - Medications
+ - Race/ethnicity
+ - Sex
+
+**Planned for future release:**
+
+ - Past health records
+ - Genetic information
+
+**Bio-repository samples are available for research upon request and appropriate funding. This will also require a Data Use Agreement and Material Transfer Agreement. To request access to controlled variables or bio-repository samples, please send an email to [[email protected]](mailto:[email protected]@example.com).**