update readme to nudge towards nix

README.md

@@ -122,22 +122,35 @@ require Rails.root.join('edge', 'spec', 'edge_helper')
 
 ## Development
 
-After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+This project uses nix to manage the dev environment.
 
-To install this gem onto your local machine, run `bundle exec rake install`.
+This project additionally uses
+- [direnv](https://github.com/direnv/direnv)
+- flakes
 
-To release a new version, follow the instructions in [PUBLISHING.md](PUBLISHING.md).
+If you don't have flakes enabled, you can enable them by adding `experimental-features = flakes` to your `~/.config/nix/nix.conf` file.
+(or running )
 
-### Nix support
+typing `direnv allow` loads the dev environment including a compatible ruby, sqlite, and gems.
 
-In order to get Nix working you need to have [direnv](https://github.com/direnv/direnv) installed. You will have to `direnv allow` to load the current `.envrc`. You can then run from the top level folder:
+To modify gem dependencies, use the bundle wrappers
+- `bundle-lock` to update the lockfile
+- `bundle-update` to update gems & the lockfile
+then run `bundix` to update the `gemset.nix` file.
 
-```
-bundle-update
-bundix
-```
+### Usage Without Nix
+
+Usage without nix is unsupported but may work anyways. Try the following:
 
-to update gems & update the gemset.nix
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`.
+
+Note: We only support adding gems and dependencies using nix.
+
+### Publishing
+
+To release a new version, follow the instructions in [PUBLISHING.md](PUBLISHING.md).
 
 ## Contributing