Improve startuptime | remove un-needed plugins | lazy load plugin highlights too

removed nvim-gps as nvim-navic or winbar.nvim will be added when v0.8 neovim releases. Removed lsp signature as I was able to emulate showing args with the default signature help() window

lua/core/utils.lua

@@ -114,13 +114,6 @@ M.load_mappings = function(mappings, mapping_opt)
    end
 end
 
--- load plugin after entering vim ui
-M.packer_lazy_load = function(plugin)
-   vim.defer_fn(function()
-      require("packer").loader(plugin)
-   end, 0)
-end
-
 -- remove plugins defined in chadrc
 M.remove_default_plugins = function(plugins)
    local removals = M.load_config().plugins.remove or {}