revert: docs back to .md files until prettier supports mdx

docs/docs/experiments/template.md

@@ -0,0 +1,20 @@
+---
+# This is a template for an experiments documentation
+# Copy this page and fill in the details as necessary
+title: '--- Template ---'
+sidebar_position: -1 # Always push to the top
+draft: true # Hide in production
+---
+
+# \{Name of Experiment\}
+
+- Issue: #\{issue\}
+- Environment variable: `TASK_X_{feature}`
+- Breaks:
+  - \{list any existing functionality that will be broken by this experiment\}
+- Deprecations:
+  - \{link to any deprecation pages related to this experiment\}
+
+\{Short description of the feature\}
+
+\{Short explanation of how users should migrate to the new behavior\}