feat(recipes): add neo-tree dark theme recipe

lua/astrocommunity/recipes/neo-tree-dark/README.md

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+# neo-tree.nvim dark theme
+
+Dark themed color scheme for `neo-tree.nvim`
+
+**Repository**: https://github.com/nvim-neo-tree/neo-tree.nvim
+
+_Note_: Highlight groups are designed to match `astrotheme`. Customize the table if you are using different colorscheme.

lua/astrocommunity/recipes/neo-tree-dark/init.lua

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+-- theme colors
+local colors = {
+  dark = "#111317",
+  light = "#777777",
+  neutral = "#8094B4",
+  backdrop = "#61afef",
+}
+
+local new_highlights = {
+  -- indentline marker
+  NeoTreeIndentMarker = { fg = colors.neutral },
+
+  -- file tree window separator
+  NeoTreeWinSeparator = { fg = colors.dark, bg = colors.dark },
+
+  -- info messages
+  NeoTreeMessage = { link = "NeoTreeDotfile" },
+
+  -- normal mode appearance
+  NeoTreeNormal = { bg = colors.dark },
+  NeoTreeNormalNC = { link = "NeoTreeNormal" },
+
+  -- dotfiles
+  NeoTreeDotfile = { fg = colors.light },
+  NeoTreeDotfiles = { link = "NeoTreeDotfile" },
+
+  -- tabs
+  NeoTreeTabActive = { fg = colors.dark, bg = colors.backdrop, bold = true },
+  NeoTreeTabInactive = { fg = colors.light, bg = colors.dark },
+
+  -- tab separators
+  NeoTreeTabSeparatorActive = { fg = colors.backdrop, bg = colors.backdrop },
+  NeoTreeTabSeparatorInactive = { link = "NeoTreeWinSeparator" },
+
+  -- file operations prompt
+  NeoTreeTitleBar = { link = "NeoTreeTabActive" },
+  NeoTreeFloatNormal = { bg = colors.dark },
+  NeoTreeFloatBorder = { fg = colors.backdrop, bg = colors.dark },
+}
+
+return {
+  "AstroNvim/astroui",
+  ---@param opts AstroUIOpts
+  opts = function(_, opts)
+    if not opts.highlights then opts.highlights = {} end
+    local astrodark = opts.highlights.astrodark
+    if type(astrodark) == "function" then
+      opts.highlights.astrodark = function(...) return require("astrocore").extend_tbl(astrodark(...), new_highlights) end
+    else
+      opts.highlights.astrodark = require("astrocore").extend_tbl(astrodark, new_highlights)
+    end
+
+    if not opts.icons then opts.icons = {} end
+    opts.icons.GitAdd = "󰬈" -- set icon for git symbols
+    opts.icons.GitChange = "󰬔"
+    opts.icons.GitDelete = "󰬋"
+    opts.icons.GitRenamed = "󰬙"
+    opts.icons.GitUntracked = "󰬛"
+    opts.icons.GitIgnored = "󰬐"
+    opts.icons.GitUnstaged = "󰬜"
+    opts.icons.GitStaged = "󰬚"
+    opts.icons.GitConflict = "󰬊"
+  end,
+}