[readme] Add notes on usage + deployment platforms

Author: sman591

README.md

@@ -18,6 +18,13 @@ Originally developed for [BrickHack](https://github.com/codeRIT/brickhack.io), t
 
 **_HackathonManager is in the midst of a significant change to how it's deployed. If you're looking to use this *right now,* reach out to [Stuart Olivera](https://github.com/sman591)_**
 
+HackathonManager is intended to be a standalone web app separate from your regular marketing website/public homepage. A typical setup would be:
+
+- **brickhack.io** — Marketing site with event info, schedule, sponsors, etc and a button to apply
+- **apply.brickhack.io** — HackathonManager deployment to accept hacker applications + host management dashboard
+
+This allows your public marketing site to operate however you want it (e.g. GitHub pages) while HackathonManager lives in an isolated, consistent environment.
+
 HackathonManager uses a variety of third-party services & Ruby gems:
 
 - [Devise](https://github.com/plataformatec/devise) + [MyMLH](https://my.mlh.io/) (authentication & attendee identity)
@@ -43,7 +50,12 @@ Be sure to review all of these before going live!
 
 ## Deployment
 
-Deployment to Heroku and Dokku is supported out of the box, though anything that operates on Heroku's buildpacks should work too.
+HackathonManager supports two platforms out of the box:
+
+- [Heroku](https://www.heroku.com) — Easiest & quickest way that requires little server knowledge, however isn't cheap (can't run on free tier)
+- [Dokku](http://dokku.viewdocs.io/dokku/) — A free alternative to Heroku, runs on your own virtual machine.
+
+HackathonManager can also be deployed the same as any other Rails app, however this is **not** natively supported and will require you to fork this repo to integrate code changes.
 
 [![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)