Remove remaining Dokku files

.buildpacks

@@ -1 +0,0 @@
-https://github.com/hashnuke/heroku-buildpack-elixir  

config/dokku.exs

@@ -1,25 +0,0 @@
-import Config
-
-config :pleroma, Pleroma.Web.Endpoint,
-  http: [
-    port: String.to_integer(System.get_env("PORT") || "4000"),
-    protocol_options: [max_request_line_length: 8192, max_header_value_length: 8192]
-  ],
-  protocol: "http",
-  secure_cookie_flag: false,
-  url: [host: System.get_env("APP_HOST"), scheme: "https", port: 443],
-  secret_key_base: "+S+ULgf7+N37c/lc9K66SMphnjQIRGklTu0BRr2vLm2ZzvK0Z6OH/PE77wlUNtvP"
-
-database_url =
-  System.get_env("DATABASE_URL") ||
-    raise """
-    environment variable DATABASE_URL is missing.
-    For example: ecto://USER:PASS@HOST/DATABASE
-    """
-
-config :pleroma, Pleroma.Repo,
-  # ssl: true,
-  url: database_url,
-  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
-
-config :pleroma, :instance, name: "#{System.get_env("APP_NAME")} CI Instance"