feat(colorscheme): Add Everblush (#1221)

Author: rednur01

lua/astrocommunity/colorscheme/everblush-nvim/README.md

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+# everblush.nvim
+
+A dark, vibrant, and beautiful color scheme for Neovim
+
+**Repository:** <https://github.com/Everblush/nvim>

lua/astrocommunity/colorscheme/everblush-nvim/init.lua

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+return { "Everblush/nvim", name = "everblush", lazy = true }