fix: preserve layout options and item positioning - #78

Changed pages include:

• index.html - view
• 404.html - view
• example/index.html - view
• guide/index.html - view
• zh/index.html - view
• example/allow-overlap.html - view
• example/auto-height.html - view
• example/basic.html - view
• example/bounded.html - view
• example/composable-api.html - view

There are more changes not included in the list