refactor a bit

1. change theme to colorscheme
2. update plugin load logic

core/plugins.vim

@@ -1,7 +1,7 @@
 scriptencoding utf-8
 
 " Plugin specification and lua stuff
-lua require('lua-init')
+lua require('plugins')
 
 " Use short names for common plugin manager commands to simplify typing.
 " To use these shortcuts: first activate command line with `:`, then input the

init.lua

@@ -21,12 +21,12 @@ if nvim_ver ~= expected_ver then
 end
 
 local core_conf_files = {
-  "globals.vim",
-  "options.vim",
-  "autocommands.vim",
-  "mappings.vim",
-  "plugins.vim",
-  "themes.lua",
+  "globals.vim",       -- some global settings
+  "options.vim",       -- setting options in nvim
+  "autocommands.vim",  -- various autocommands
+  "mappings.vim",      -- all the user-defined mappings
+  "plugins.vim",       -- all the plugins installed and their configurations
+  "colorschemes.lua",  -- colorscheme settings
 }
 
 -- source all the core config files

lua/lua-init.lua

@@ -1,5 +0,0 @@
--- Some utility stuff
-require 'utils'
-
--- plugin installation
-require 'plugins'