Move CONTRIBUTORS.md to _extras

Author: maxim-belkin

CONTRIBUTORS.md _extras/CONTRIBUTORS.mdCONTRIBUTORS.md renamed to _extras/CONTRIBUTORS.md

@@ -1,3 +1,8 @@
+---
+layout: page
+title: About Contributors
+permalink: /contributors/
+---
 The materials in this python-ecology-lesson repository were initially developed
 and adapted and continue to be revised by many contributors. Some of the lessons
 were adapted from Software Carpentry materials.
@@ -9,8 +14,6 @@ conference in Boulder, Colorado by Leah Wasser (NEON,Inc) and Mariela Perignon.
 
 ## Data
 
-### Biology
-
 Data is from the paper S. K. Morgan Ernest, Thomas J. Valone, and James H.
 Brown. 2009. Long-term monitoring and experimental manipulation of a Chihuahuan
 Desert ecosystem near Portal, Arizona, USA. Ecology 90:1708.