nvim: mv ui.lua -> tools.lua

.config/nvim/init.lua

@@ -5,7 +5,7 @@ require('my/keymaps')
 require('my/fileformats')
 require('my/completion')
 require('my/lsp')
-require('my/ui')
+require('my/tools')
 require('my/coding')
 require('my/net')
 

.config/nvim/lua/my/coding.lua

@@ -1,6 +1,6 @@
 require('my/plugins')
 require('my/keymaps')
-require('my/ui')
+require('my/tools')
 
 packer.use {                                -- toggle comments
     'https://github.com/tomtom/tcomment_vim',