refactor(nvim): set cmdheight to 1

The current implementation of cmdheight = 0 is buggy as all hell
unfortunately. It looks very nice, but it's not ready for use. Will
check it out come Neovim 0.8 stabilization at the end of September.

dots/.nvim-environments/primary/config/lua/core/options.lua

@@ -117,8 +117,8 @@ M.setup = function()
     opt.modeline = true
     opt.modelines = 5
 
-    -- Set command bar height to hide when not in use
-    opt.cmdheight = 0
+    -- Set command bar height
+    opt.cmdheight = 1
 end
 
 return M