feat(extras): update Alacritty color schemes

[S1M0N38]

• Remove alacritty_kanagawa.yml and alacritty_kanagawa_dragon.yml
• Add new TOML color schemes: alacritty_kanagawa_dragon.toml, alacritty_kanagawa_lotus.toml, and alacritty_kanagawa_wave.toml

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Alacritty now use TOML for configuration (and themes), not YAML anymore.

[Kypert]

Looks like a good combination of #222 and #196. Only diff I could see is that #222 also defines dim_foreground and bright_foreground in the lotus theme, but not sure if they are needed.

I will be using this one for now :)

[S1M0N38]

I don't think you need to define bright and dim foregrounds if you plan to use the same color.