Move the habit-screens project into //website

I'd like to eventually deploy this to wpcarro.dev. Coming soon!

website/habit-screens/README.md

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+# Habit Screens
+
+Problem: I would like to increase the rate at which I complete my daily, weekly,
+monthly, yearly habits.
+
+Solution: Habit Screens are mounted in strategic locations throughout my
+apartment. Each Habit Screen displays the habits that I should complete that
+day, and I can tap each item to mark it as complete. I will encounter the Habit
+Screens in my bedroom, kitchen, and bathroom, so I will have adequate "cues" to
+focus my attention. By marking each item as complete and tracking the results
+over time, I will have more incentive to maintain my consistency
+(i.e. "reward").
+
+## Elm
+
+Elm has one of the best developer experiences that I'm aware of. The error
+messages are helpful and the entire experience is optimized to improve the ease
+of writing web applications.
+
+### Developing
+
+If you're interested in contributing, the following will create an environment
+in which you can develop:
+
+```shell
+$ nix-shell
+$ npx tailwindcss build index.css -o output.css
+$ elm-live -- src/Main.elm --output=Main.min.js
+```
+
+You can now view your web client at `http://localhost:8000`!