add mappings btn in nvdash

lua/core/mappings.lua

@@ -43,6 +43,7 @@ M.general = {
 
     -- new buffer
     ["<leader>b"] = { "<cmd> enew <CR>", "new buffer" },
+    ["<leader>ch"] = { "<cmd> NvCheatsheet <CR>", "Mapping cheatsheet" },
   },
 
   t = {
@@ -263,7 +264,6 @@ M.telescope = {
     ["<leader>fb"] = { "<cmd> Telescope buffers <CR>", "find buffers" },
     ["<leader>fh"] = { "<cmd> Telescope help_tags <CR>", "help page" },
     ["<leader>fo"] = { "<cmd> Telescope oldfiles <CR>", "find oldfiles" },
-    ["<leader>tk"] = { "<cmd> Telescope keymaps <CR>", "show keys" },
 
     -- git
     ["<leader>cm"] = { "<cmd> Telescope git_commits <CR>", "git commits" },