feat(pack): add tailwindcss pack

lua/astrocommunity/pack/tailwindcss/README.md

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+# tailwindcss Language Pack
+
+This plugin pack does the following:
+
+- Adds `css` Treesitter parser
+- Adds `tailwindcss` and `cssls` language servers
+- Adds `prettier` and `rustywind` formatters
+- Adds `roobert/tailwindcss-colorizer-cmp.nvim` to cmp completion sources

lua/astrocommunity/pack/tailwindcss/tailwindcss.lua

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+local utils = require "astrocommunity.utils"
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table or string "all".
+      if not opts.ensure_installed then
+        opts.ensure_installed = {}
+      elseif opts.ensure_installed == "all" then
+        return
+      end
+      -- Add the required file types to opts.ensure_installed.
+      utils.list_insert_unique(opts.ensure_installed, "css")
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table.
+      if not opts.ensure_installed then opts.ensure_installed = {} end
+      -- Add tsserver to opts.ensure_installed using vim.list_extend.
+      utils.list_insert_unique(opts.ensure_installed, { "tailwindcss", "cssls" })
+    end,
+  },
+  {
+    "jay-babu/mason-null-ls.nvim",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table
+      if not opts.ensure_installed then opts.ensure_installed = {} end
+      utils.list_insert_unique(opts.ensure_installed, { "prettier", "rustywind" })
+    end,
+  },
+  {
+    "hrsh7th/nvim-cmp",
+    dependencies = {
+      { "roobert/tailwindcss-colorizer-cmp.nvim", config = true },
+    },
+    opts = function(_, opts)
+      local format_kinds = opts.formatting.format
+      opts.formatting.format = function(entry, item)
+        format_kinds(entry, item)
+        return require("tailwindcss-colorizer-cmp").formatter(entry, item)
+      end
+    end,
+  },
+}