docs(README): Update build instructions

README.md

 # Chromabits
 
-Notes:
-- npm
-- bower
-- gulp
+Blog static site generator and content server
+
+## Development
+
+Previously you needed a few tools to build this blog (Node, Bower, Gulp). It's
+now possible to build and host this blog using just Git and Haskell.
+
+First, make sure all submodules in the repository are initialized and up to
+date. This is how we pull external dependencies like Foundation and Font
+Awesome.
+
+Next, use `stack` to build the blog generator and the server:
+
+```
+stack build -j8
+stack exec blog hakyll build
+stack exec server
+```
+
+You should now be able to go to `http://localhost:9090` to load the blog.