fix progress bars

docs/build.py

@@ -73,7 +73,7 @@ def difficulty_shields_io(difficulty):
             listdir = os.listdir(f'../{category_name}/')
             listdir = sorted(listdir, key=lambda x: int(x.split('_')[0]))
 
-            progress_bar = 'https://progress-bar.dev/' + str(round((len(listdir) / free_count) * 100))
+            progress_bar = 'https://progress-bar.xyz/' + str(round((len(listdir) / free_count) * 100))
 
             readme_file.write(f'## {category_name}\n\n')
             readme_file.write(f'<img alt="{category_name} Logo" src={category_logo} width="100"/>\n\n')
@@ -95,4 +95,4 @@ def difficulty_shields_io(difficulty):
 
                 readme_file.write(f'{problem_id} | [{title}]({category_name}/{problem_dir}) | ![Difficulty]({difficulty_shield}) | {language_badges}\n')
 
-            readme_file.write('\n')
+            readme_file.write('\n')