Add link to the centralized docs issue tracker

README.md

@@ -13,7 +13,7 @@ repo](https://github.com/amplab/e-mission-phone)
 The current build status is:
 [![Build Status](https://amplab.cs.berkeley.edu/jenkins/buildStatus/icon?job=e-mission-server)](https://amplab.cs.berkeley.edu/jenkins/view/E-Mission/job/e-mission-server/)
 
-[![Join the chat at https://gitter.im/e-mission/e-mission-server](https://badges.gitter.im/e-mission/e-mission-server.svg)](https://gitter.im/e-mission/e-mission-server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+**Issues:** Since this repository is part of a larger project, all issues are tracked [in the central docs repository](https://github.com/e-mission/e-mission-docs/issues). If you have a question, [as suggested by the open source guide](https://opensource.guide/how-to-contribute/#communicating-effectively), please file an issue instead of sending an email. Since issues are public, other contributors can try to answer the question and benefit from the answer.
 
 The backend in turn consists of two parts - a summary of their code structure is shown below.
 -![][Python_Structure]