dev-community.txt: Move 'System Design' into 'Project Information' section

The system design doc discusses high-level considerations about the
project, which makes the 'Project Infomation' section a more suitable
place to contain this link.

Change-Id: Iee4a1bef6bf800ff3d96b063fdb22f1502005d98
Signed-off-by: Edwin Kempin <ekempin@google.com>

Documentation/dev-community.txt

diff --git a/Documentation/dev-community.txt b/Documentation/dev-community.txt
index ec1f9a3..ebe48cf 100644
--- a/Documentation/dev-community.txt
+++ b/Documentation/dev-community.txt
@@ -9,6 +9,7 @@
 * link:https://gerrit.googlesource.com/gerrit[Source]
 * link:https://bugs.chromium.org/p/gerrit/issues/list[Issue Tracking]
 * link:https://gerrit-review.googlesource.com/q/status:open+project:gerrit[Change Review]
+* link:dev-design.html[System Design]
 
 == Developer
 . Getting Started
@@ -21,7 +22,6 @@
 .. link:config-validation.html[Validation Interfaces]
 .. link:dev-stars.html[Starring Changes]
 .. link:quota.html[Quota Enforcement]
-. link:dev-design.html[System Design]
 
 == Maintainer
 . link:dev-release.html[Making a Gerrit Release]