Update README on how to contribute.
The ===FOOD=== heading at OLON's no longer costs 500 silver to select.

As a placeholder, this reaction should neither require reagents
or produce products.
Settings changed to use default theme by default, as that's how Meph ships. :)
Merge branch 'master' into nerfed_diseases

* master:
  Settings changed to use default theme by default, as that's how Meph ships. :)
  The ===FOOD=== heading at OLON's no longer costs 500 silver to select.
  Update README on how to contribute.