Added

• Support for pinned posts and the Mastodon "featured posts" collection.
• X-Ray Mode for viewing and navigating JSON-LD resource (actor, object, etc.) representations.
• Back links on thread pages for easier navigation. (fixes #1)
• License page for LibreJS compliance. (fixes #127)
• Highlighting of recently fetched hashtagged posts.

Changed

• Improved presentation of audio and video media.
• Refactored theming/styling implementation.