Ink: elegant academic theme with EB Garamond and purple palette.
Opal: modern minimalist with Lato and teal accents.
Ember: editorial theme with mixed Gentium Book Plus/Ubuntu fonts,
crimson accents, diamond bullets, and justified-with-no-hyphenation.
Updates README theme grid from 2x3 to 3x3 to showcase all 9 themes.
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