fix contributor form url, closes #369

Author: puredanger

CONTRIBUTING.md

@@ -8,5 +8,5 @@ You can find more info on the page [Contributing to the site].
 [Contributions]: https://clojure.org/community/contributing_site
 [issue]: https://github.com/clojure/clojure-site/issues
 [pull request]: https://github.com/clojure/clojure-site/pulls
-[contributor agreement]: https://secure.echosign.com/public/hostedForm?formid=95YMDL576B336E
+[contributor agreement]: https://secure.na1.echosign.com/public/hostedForm?formid=95YMDL576B336E
 [Contributing to the site]: https://clojure.org/community/contributing_site

content/community/contributing.adoc

@@ -7,7 +7,7 @@ Rich Hickey
 
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
-Following the lead of other open source projects, the Clojure project requires contributors to jointly assign their copyright on contributed code. The https://secure.echosign.com/public/hostedForm?formid=95YMDL576B336E[Contributor Agreement] (CA) gives Rich Hickey and the contributor joint copyright interests in the code: the contributor retains copyrights while also granting those rights to Rich Hickey as the open source project sponsor.
+Following the lead of other open source projects, the Clojure project requires contributors to jointly assign their copyright on contributed code. The https://secure.na1.echosign.com/public/hostedForm?formid=95YMDL576B336E[Contributor Agreement] (CA) gives Rich Hickey and the contributor joint copyright interests in the code: the contributor retains copyrights while also granting those rights to Rich Hickey as the open source project sponsor.
 
 The CA is derived from the Oracle Contributor Agreement (OCA), used for OpenJDK, Netbeans and OpenSolaris projects and others. There is a good http://www.oracle.com/technetwork/oca-faq-405384.pdf[OCA FAQ] answering many questions.
 

content/community/contributing_site.adoc

@@ -24,7 +24,7 @@ If you wish to make a contribution (typo, modification, or new content), you mus
 [[contributor]]
 == How To Become a Contributor
 
-Contributors must sign the Clojure Contributor Agreement prior to submitting changes. The https://secure.echosign.com/public/hostedForm?formid=95YMDL576B336E[Contributor Agreement] (CA) gives Rich Hickey and the contributor joint copyright interests: the contributor retains copyrights while also granting those rights to Rich Hickey as the open source project sponsor.
+Contributors must sign the Clojure Contributor Agreement prior to submitting changes. The https://secure.na1.echosign.com/public/hostedForm?formid=95YMDL576B336E[Contributor Agreement] (CA) gives Rich Hickey and the contributor joint copyright interests: the contributor retains copyrights while also granting those rights to Rich Hickey as the open source project sponsor.
 
 The CA is derived from the Oracle Contributor Agreement (OCA), used for OpenJDK, Netbeans and OpenSolaris projects and others. There is a good http://www.oracle.com/technetwork/oca-faq-405384.pdf[OCA FAQ] answering many questions.