Add Safari-flavored icons.

[zorn]

Server does not have icons attempting to be loaded by Safari.

[info] GET /apple-touch-icon-precomposed.png
[debug] ** (Phoenix.Router.NoRouteError) no route found for GET /apple-touch-icon-precomposed.png (FlickWeb.Router)
    (flick 0.1.0) deps/phoenix/lib/phoenix/router.ex:541: FlickWeb.Router.call/2
    (flick 0.1.0) lib/flick_web/endpoint.ex:2: FlickWeb.Endpoint.plug_builder_call/2
    (flick 0.1.0) deps/plug/lib/plug/debugger.ex:136: FlickWeb.Endpoint."call (overridable 3)"/2
    (flick 0.1.0) lib/flick_web/endpoint.ex:2: FlickWeb.Endpoint.call/2
    (phoenix 1.7.18) lib/phoenix/endpoint/sync_code_reload_plug.ex:22: Phoenix.Endpoint.SyncCodeReloadPlug.do_call/4
    (bandit 1.6.1) lib/bandit/pipeline.ex:127: Bandit.Pipeline.call_plug!/2
    (bandit 1.6.1) lib/bandit/pipeline.ex:36: Bandit.Pipeline.run/4
    (bandit 1.6.1) lib/bandit/http1/handler.ex:12: Bandit.HTTP1.Handler.handle_data/3
    (bandit 1.6.1) lib/bandit/delegating_handler.ex:18: Bandit.DelegatingHandler.handle_data/3
    (bandit 1.6.1) /Users/zorn/ProjectRepos/flick/deps/thousand_island/lib/thousand_island/handler.ex:385: Bandit.DelegatingHandler.handle_info/2
    (stdlib 6.1.2) gen_server.erl:2345: :gen_server.try_handle_info/3
    (stdlib 6.1.2) gen_server.erl:2433: :gen_server.handle_msg/6
    (stdlib 6.1.2) proc_lib.erl:329: :proc_lib.init_p_do_apply/3

[info] GET /apple-touch-icon.png
[debug] ** (Phoenix.Router.NoRouteError) no route found for GET /apple-touch-icon.png (FlickWeb.Router)
    (flick 0.1.0) deps/phoenix/lib/phoenix/router.ex:541: FlickWeb.Router.call/2
    (flick 0.1.0) lib/flick_web/endpoint.ex:2: FlickWeb.Endpoint.plug_builder_call/2
    (flick 0.1.0) deps/plug/lib/plug/debugger.ex:136: FlickWeb.Endpoint."call (overridable 3)"/2
    (flick 0.1.0) lib/flick_web/endpoint.ex:2: FlickWeb.Endpoint.call/2
    (phoenix 1.7.18) lib/phoenix/endpoint/sync_code_reload_plug.ex:22: Phoenix.Endpoint.SyncCodeReloadPlug.do_call/4
    (bandit 1.6.1) lib/bandit/pipeline.ex:127: Bandit.Pipeline.call_plug!/2
    (bandit 1.6.1) lib/bandit/pipeline.ex:36: Bandit.Pipeline.run/4
    (bandit 1.6.1) lib/bandit/http1/handler.ex:12: Bandit.HTTP1.Handler.handle_data/3
    (bandit 1.6.1) lib/bandit/delegating_handler.ex:18: Bandit.DelegatingHandler.handle_data/3
    (bandit 1.6.1) /Users/zorn/ProjectRepos/flick/deps/thousand_island/lib/thousand_island/handler.ex:385: Bandit.DelegatingHandler.handle_info/2
    (stdlib 6.1.2) gen_server.erl:2345: :gen_server.try_handle_info/3
    (stdlib 6.1.2) gen_server.erl:2433: :gen_server.handle_msg/6
    (stdlib 6.1.2) proc_lib.erl:329: :proc_lib.init_p_do_apply/3