1. add navbar at top
2. change root route
1. route changes
2. UI minor changes
3. 抓取財報間隔5秒，避免被擋
1. 含值者標注淺黃色
2. 各item不再標示parent item name
Fix bug causes html_file been overwritten with 24 bytes
add join model: ItemStockPair to speed up view rendering
fix bug causes misjudging 'has_value' of items
send user-agent (web statement downloader)
parsing period can be assigned now