Uses new API features for preview, deleting, pinning, and closing. Refactors and improves styling to match new mockups.
Adds the new post filter bar element.
Implemented a ScrollThreshold reusable component to detect scrolling
events, which can be used in the place of a Button.
Removed the i18n entry created for the Button, which is no longer
needed.
This adds a major chunk of UI code to the application covering topic listing,
topic filtering, subtopic browsing, browsing posts by topic, filtering unread
posts, filtering followed posts, sorting posts by recent activity, most activty
and most votes, liking/unliking a post, following/unfollowing a post, listing
comments and replis in a post.
Co-authored-by: Kshitij Sobti <kshitij@sobti.in>
