Indicate more clearly that docker-compose is just a guideline

Fixes #5 #9 #15 #19

README.md

@@ -12,6 +12,8 @@ Official bootstrap for running your own [Sentry](https://sentry.io/) with [Docke
 Assuming you've just cloned this repository, the following steps
 will get you up and running in no time!
 
+There may need to be modifications to the included `docker-compose.yml` file to accommodate your needs or your environment. These instructions are a guideline for what you should generally do.
+
 1. `mkdir -p data/{sentry,postgres}` - Make our local database and sentry config directories.
     This directory is bind-mounted with postgres so you don't lose state!
 2. `docker-compose run --rm web config generate-secret-key` - Generate a secret key.

docker-compose.yml

@@ -1,3 +1,8 @@
+# NOTE: This docker-compose.yml is meant to be just an example of how
+# you could accomplish this on your own. It is not intended to work in
+# all use-cases and must be adapted to fit your needs. This is merely
+# a guideline.
+
 # See docs.getsentry.com/on-premise/server/ for full
 # instructions