chore: add uninstall steps to remove a Coder OSS deployment from docs (#3742)

Co-authored-by: Ben <ben@coder.com>

docs/install/uninstall.md

@@ -0,0 +1,68 @@
+# Uninstall
+
+This article walks you through how to uninstall your Coder server.
+
+To uninstall your Coder server, delete the following directories.
+
+## Cached Coder releases
+
+```console
+rm -rf ~/.cache/coder
+```
+
+## The Coder server binary and CLI
+
+Debian, Ubuntu:
+
+```sh
+sudo apt remove coder
+```
+
+Fedora, CentOS, RHEL, SUSE:
+
+```sh
+sudo yum remove coder
+```
+
+Alpine:
+
+```sh
+sudo apk del coder
+```
+
+If you installed Coder manually or used the install script on an unsupported operating system, you can remove the binary directly:
+
+```console
+sudo rm /usr/local/bin/coder
+```
+
+## Coder as a system service configuration
+
+```console
+sudo rm /etc/coder.d/coder.env
+```
+
+## Coder settings and the optional built-in PostgreSQL database
+
+> There is a `postgres` directory within the `coderv2` directory that has the
+> database engine and database. If you want to reuse the database, consider
+> not performing the following step or copying the directory to another
+> location.
+
+### macOS
+
+```console
+rm -rf ~/Library/Application\ Support/coderv2
+```
+
+### Linux
+
+```console
+rm -rf ~/.config/coderv2
+```
+
+### Windows
+
+```console
+C:\Users\USER\AppData\Roaming\coderv2
+```