add link to official-ish install docs

docs/INSTALL.md

@@ -6,14 +6,18 @@ We have deliberately left this section lacking. From our FAQ:
 > Please experiment with it, play with it, give us feedback, submit pull requests – but any consideration
 > of fully adopting Discourse is for people and organizations who are eager to live on the bleeding and broken edge.
 
-When Discourse is ready for primetime we're going to provide several robust and easy ways to install it.
-Until then, if you are feeling adventurous you can try to set up following components.
+Discourse has two fairly decent install documents now.
+
+- Our [**official Ubuntu Server 12.04 LTS install document**][1]
+- [Unofficial Heroku install document][2]
+- 
+Beyond that, if you are feeling extra *extra* adventurous you can try to set up following components manually:
 
 - Postgres 9.1
  - Enable support for HSTORE
  - Create a discourse database and seed it with a basic image
 - Redis 2.6
-- Ruby 1.9.3
+- Ruby 1.9.3 (we recommend 2.0.0-p195 or higher)
  - Install all rubygems via bundler
  - Edit database.yml and redis.yml and point them at your databases.
  - Run `rake db:seed_fu` to add seed data
@@ -23,6 +27,6 @@ Until then, if you are feeling adventurous you can try to set up following compo
  - Run a clockwork process for enqueing scheduled jobs
  - Run several Rails processes, preferably behind a proxy like Nginx.
 
-
-
+[1]: https://github.com/discourse/discourse/blob/master/docs/INSTALL-ubuntu.md
+[2]: https://github.com/discourse/discourse/blob/master/docs/HEROKU.md