add hl groups for nvcheatsheet grid theme

lua/base46/integrations/nvcheatsheet.lua

@@ -1,7 +1,6 @@
 local colors = require("base46").get_theme_tb "base_30"
 
-return {
+local M = {
-
   NvChHeading = {
     fg = colors.black,
     bg = colors.blue,
@@ -17,3 +16,23 @@ return {
     bg = colors.black2,
   },
 }
+
+local cheatsheet_theme = require("core.utils").load_config().ui.cheatsheet.theme
+
+if cheatsheet_theme == "grid" then
+  M.NvChAsciiHeader = {
+    fg = colors.blue,
+  }
+
+  local bgcols =
+    { "blue", "red", "green", "yellow", "orange", "baby_pink", "purple", "white", "cyan", "vibrant_green", "teal" }
+
+  for _, value in ipairs(bgcols) do
+    M["NvChHead" .. value] = {
+      fg = colors.black,
+      bg = colors[value],
+    }
+  end
+end
+
+return M