Applied Subscribe/Unsubscribe feature at Add/Remove button
Updated NewsListPage's UI cosmetics
Removed add/pin features in full-context-page; Added favourite/read-later features; Updated UI cosmetics
Added tutorials
Displayed backward-date for each news
Fixed full-image-news' link, refresh button, explore tile
Implemented share-news-related features
Implemented share-news-related features
Accumulated fetch-news
Implemented app-related file removal mechanism
Checked if home tile list is full
Applied UI cosmetic changes