Merge pull request #448 from mongodb/anabellabuckvar-patch-1

Add single-page redirect for v2.1 index to current

Author: anabellabuckvar

config/redirects

@@ -13,6 +13,8 @@ raw: docs/bi-connector/components/mongobischema -> ${base}/master/components/
 raw: docs/bi-connector/faq -> ${base}/master/faq/
 raw: docs/bi-connector/release-notes -> ${base}/master/release-notes/
 
+[v2.1]: docs/bi-connector/${version} -> docs/bi-connector/current/
+
 [v1.1]: docs/bi-connector/${version}/reference/mongosqld -> ${base}/${version}/components/
 [v1.1]: docs/bi-connector/${version}/tutorial/connecting -> ${base}/${version}/
 [v1.1]: docs/bi-connector/${version}/tutorial/using-the-bi/ -> ${base}/${version}/