Use an HTML fragment for the contributor agreement; link to Github.

Signed-off-by: Dan Cross <dcross@google.com>

project.config

diff --git a/project.config b/project.config
index 26563f8..3de0161 100644
--- a/project.config
+++ b/project.config
@@ -66,6 +66,6 @@
 	header = cc
 [contributor-agreement "Akaros"]
 	description = If you contribute to Akaros please read our Contributing documentation and agree to our policies.
-	agreementUrl = https://github.com/akaros/akaros/Documentation/Contributing.md
+	agreementUrl = static/cla.html
 	autoVerify = group Akaros-CLA-Accepted
 	accepted = group Akaros-CLA-Accepted