Update README to point to monorepo

README.md

@@ -1,56 +1,7 @@
-# Mattermost Web App
-# [![Mattermost](https://user-images.githubusercontent.com/7205829/137170381-fe86eef0-bccc-4fdd-8e92-b258884ebdd7.png)](https://mattermost.com)
+# The Mattermost web app no longer lives in this repository since we have moved to using a monorepo located in https://github.com/mattermost/mattermost-server.
 
-[Mattermost](https://mattermost.com) is an open source platform for secure collaboration across the entire software development lifecycle. This repo is the primary source for core development on the Mattermost platform; it's written in Golang and React, and runs as a single Linux binary with MySQL or PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
+[Our developer setup instructions](https://developers.mattermost.com/contribute/developer-setup/) have been updated to use the monorepo, and we're going to be continuing to update our developer documentation to reflect the new setup over the next couple weeks.
 
-<img width="1006" alt="mattermost-hero" src="https://user-images.githubusercontent.com/7205829/136107976-7a894c9e-290a-490d-8501-e5fdbfc3785a.png">
+All changes going forward should be made in the monorepo since we're no longer accepting PRs in this repository, and any existing PRs should be resubmitted over there. We have some notes on how to do that migration [here](https://developers.mattermost.com/contribute/monorepo-migration-notes/), but most of the code that was previously in this repository is now located in either [`webapp/channels`](https://github.com/mattermost/mattermost-server/tree/master/webapp/channels) or [`webapp/platform`](https://github.com/mattermost/mattermost-server/tree/master/webapp/platform) in the monorepo. We were unable to maintain Git history with the move, so migrating PRs to the new repo will likely involve a lot of manually copying changes to their new locations.
 
-This repo hosts the webapp client code. If you'd like to report an issue with Mattermost, please create an issue on [mattermost-server](https://github.com/mattermost/mattermost-server), which hosts the server code. You can also look at the [Get Help With Mattermost](https://docs.mattermost.com/guides/get-help.html) guide to find the resources available to our community.
-
-- [Product documentation](https://docs.mattermost.com/)
-- [Developer documentation](https://developers.mattermost.com/)
-- [Download compiled version](https://mattermost.com/download)
-
-## Try out Mattermost
-
-- [Join the Mattermost Contributor's server](https://community.mattermost.com/signup_user_complete/?id=codoy5s743rq5mk18i7u5ksz7e) to join community discussions about contributions, development and more
-- [Get started with Mattermost Cloud](https://customers.mattermost.com/cloud/signup) to try out Mattermost
-
-[![Deploy a Preview](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/mattermost/mattermost-heroku)
-
-_Note: Heroku preview does not include email or persistent storage._
-
-## Install Mattermost
-
-- [Deploy Guide](https://docs.mattermost.com/guides/deployment.html) - Deploy Mattermost in minutes via Docker, Ubuntu, or tar.
-- [Developer Machine Setup](https://developers.mattermost.com/contribute/server/developer-setup) - Follow this guide if you want to write code for Mattermost
-
-Other Install Guides:
-- [Deploy Mattermost on Docker](https://docs.mattermost.com/install/install-docker.html)
-- [Mattermost Omnibus](https://docs.mattermost.com/install/installing-mattermost-omnibus.html)
-- [Install Mattermost from Tar](https://docs.mattermost.com/install/install-tar.html)
-- [Ubuntu 20.04 LTS](https://docs.mattermost.com/install/installing-ubuntu-2004-LTS.html)
-- [Kubernetes](https://docs.mattermost.com/install/install-kubernetes.html)
-- [Helm](https://docs.mattermost.com/install/install-kubernetes.html#installing-the-operators-via-helm)
-- [Debian Buster](https://docs.mattermost.com/install/install-debian.html)
-- [RHEL 8](https://docs.mattermost.com/install/install-rhel-8.html)
-- [More server install guides](https://docs.mattermost.com/guides/deployment.html)
-
-## Get Involved
-
-- [Contribute to Mattermost](https://handbook.mattermost.com/contributors/contributors/ways-to-contribute)
-- [Find "Help Wanted" projects](https://github.com/mattermost/mattermost-server/issues?page=1&q=is%3Aissue+is%3Aopen+%22Help+Wanted%22&utf8=%E2%9C%93)
-- [Join Developer Discussion on a Mattermost Server for contributors](https://docs.mattermost.com/guides/community-chat.html)
-- [Get Help With Mattermost](https://docs.mattermost.com/guides/get-help.html)
-
-## Learn More
-
-- [API Options - webhooks, slash commands, drivers and web service](https://api.mattermost.com/)
-- [Localization Guide](https://handbook.mattermost.com/contributors/contributors/localization)
-
-## Get the Latest News
-
-- **Twitter** - Follow [Mattermost](https://twitter.com/Mattermost)
-- **Email** - Subscribe to our [newsletter](https://mattermost.com/community-newsletter/)
-
-Any other questions, mail us at [info@mattermost.com](mailto:info@mattermost.com). We'd love to meet you!
+This repository is being kept open until December 2023 to maintain support for our [extended support releases](https://docs.mattermost.com/upgrade/extended-support-release.html) at which point it will be archived and kept as a historical record.