Break apart config by stage; refactor project structure

lib/shortnr.ex

@@ -6,7 +6,7 @@ defmodule Shortnr do
   require Logger
   use Application
 
-  @impl Application
+  @impl true
   def start(_type, _args) do
     children = [
       {Plug.Cowboy, scheme: :http, plug: Shortnr.Router, options: [port: port()]}
@@ -22,7 +22,7 @@ defmodule Shortnr do
     Supervisor.start_link(children, strategy: :one_for_one)
   end
 
-  @impl Application
+  @impl true
   def stop(_state) do
     if ets_implementation() == :dets, do: :dets.close(:urls)
   end

lib/shortnr/url/endpoints.ex

@@ -8,7 +8,7 @@ defmodule Shortnr.URL.Endpoints do
 
   @behaviour Endpoints
 
-  @impl Endpoints
+  @impl true
   def select(conn, name, arg \\ nil)
 
   def select(conn, :list, _arg) do

lib/shortnr/url/repo/ets.ex

@@ -6,7 +6,7 @@ defmodule Shortnr.URL.Repo.ETS do
 
   @behaviour Repo
 
-  @impl Repo
+  @impl true
   def get(key) do
     case ets().lookup(:urls, key) |> List.first() do
       {_, url} -> {:ok, url}
@@ -14,25 +14,25 @@ defmodule Shortnr.URL.Repo.ETS do
     end
   end
 
-  @impl Repo
+  @impl true
   def put(url) do
     :ok = ets().insert(:urls, {url.id, url})
     :ok
   end
 
-  @impl Repo
+  @impl true
   def list do
     resp = ets().select(:urls, [{:"$1", [], [:"$1"]}])
     {:ok, resp |> Enum.map(&elem(&1, 1))}
   end
 
-  @impl Repo
+  @impl true
   def delete(key) do
     :ok = ets().delete(:urls, key)
     :ok
   end
 
-  @impl Repo
+  @impl true
   def reset do
     :ok = ets().delete_all_objects(:urls)
   end