MNT: move these docs where people can actually find them!

Author: nstelter-slac

.github/CONTRIBUTING.md renamed to CONTRIBUTING.md

@@ -22,9 +22,9 @@
   ·
   <a href="https://github.com/slaclab/pydm/issues/new?template=feature-request.md&labels=request">Request feature</a>
   ·
-  <a href="https://github.com/slaclab/pydm/blob/master/.github/CONTRIBUTING.md">How to Contribute</a>
+  <a href="https://github.com/slaclab/pydm/blob/master/CONTRIBUTING.md">How to Contribute</a>
   ·
-  <a href="https://github.com/slaclab/pydm/blob/master/.github/SUPPORT.md">Support</a>
+  <a href="https://github.com/slaclab/pydm/blob/master/SUPPORT.md">Support</a>
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