Bug 1594907 - [docs] Fix accidental redirection of 'taskcluster/taskcluster-config.html', r=sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D52418

--HG--
rename : taskcluster/docs/taskcluster-config.rst => taskcluster/docs/config.rst
extra : moz-landing-system : lando

taskcluster/docs/index.rst

@@ -32,6 +32,6 @@ check out the :doc:`how-to section <how-tos>`.
     actions
     release-promotion
     versioncontrol
-    taskcluster-config
+    config
     how-tos
     reference