add some features

lua/custom/configs/maps.lua

@@ -49,3 +49,4 @@ map("n", "<leader>s", [[:%s/\<<C-r><C-w>\>/<C-r><C-w>/gI<Left><Left><Left>]])
 
 -- Reset highlight
 map("n", "<CR>", "<CMD>noh<CR><CR>")
+

lua/custom/configs/settings.lua

@@ -42,5 +42,8 @@ o.timeoutlen = 500
 
 -- Spell check
 opt.spelllang = 'en_us'
-opt.spell = false
+opt.spell = true
+
+-- Markdown
+global.mkdp_browser = '/usr/bin/firefox'