Fix incorrect login redirect (#64)

src/handlers/auth_handler.cr

@@ -63,7 +63,10 @@ class AuthHandler < Kemal::Handler
   end
 
   def handle_auth(env)
-    return call_next(env) if request_path_startswith env, ["/login", "/logout"]
+    if request_path_startswith env, ["/login", "/logout"] ||
+                                    requesting_static_file env
+      return call_next(env)
+    end
 
     unless validate_token env
       env.session.string "callback", env.request.path

src/handlers/static_handler.cr

@@ -16,10 +16,8 @@ class FS
 end
 
 class StaticHandler < Kemal::Handler
-  @dirs = ["/css", "/js", "/img", "/favicon.ico"]
-
   def call(env)
-    if request_path_startswith env, @dirs
+    if requesting_static_file env
       file = FS.get? env.request.path
       return call_next env if file.nil?