Release Changelog 1.9.0

Added

• Added an opt-in two-column release timeline. Add rc-release-index--timeline to the changelog index Group to place free-tier releases left of a center line and paid releases right, collapsing to a single column below 1024px. Width and column spacing are adjustable with --rc-release-timeline-max-width and --rc-timeline-spine-gap.
• Added a product tier class to release posts so an archive layout can distinguish free and paid releases.

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