feat: themes (#113)

* feat: themes

* feat: flexoki theme

* feat: onedark theme

* feat: monokai pro theme

* feat: opencode theme (default)

* feat: dracula theme

* feat: tokyonight theme

* feat: tron theme

* some small fixes

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Co-authored-by: Kujtim Hoxha <kujtimii.h@gmail.com>