Remove distracting extra code

mix.exs

@@ -56,7 +56,6 @@ defmodule BirdyChat.MixProject do
        app: false,
        compile: false,
        depth: 1},
-      {:swoosh, "~> 1.16"},
       {:req, "~> 0.5"},
       {:telemetry_metrics, "~> 1.0"},
       {:telemetry_poller, "~> 1.0"},
@@ -66,9 +65,6 @@ defmodule BirdyChat.MixProject do
       {:bandit, "~> 1.5"},
       {:credo, "~> 1.0", only: [:dev, :test]},
 
-      # Phoenix sockets client
-      {:slipstream, "~> 1.0"},
-
       # Telemetry
       {:opentelemetry, "~> 1.0"},
       {:opentelemetry_exporter, "~> 1.0"}