bump: 2.0

[polarhive]

Pull changes from v2.0: https://github.com/kepano/flexoki/releases/tag/2.0.0

[kepano]

For the most part, no changes are needed since the theme already specifies all colors that Obsidian needs.

The only two potential changes I see

1. Specify individual colors for the callout backgrounds to avoid using transparency. This is doable but would come at the cost of the multiply filter working correctly for nested callouts.
2. The background for certain cases where accent color is lightened using opacity. The problem here is computing those values is tricky if the user has set a custom color. I need to check if the necessary CSS properties are available to handle oklch colors and calculations.