Refactors init.lua into multiple files

lua/plugin-manager.lua

@@ -0,0 +1,17 @@
+-- Install package manager
+--    https://github.com/folke/lazy.nvim
+--    `:help lazy.nvim.txt` for more info
+local lazypath = vim.fn.stdpath 'data' .. '/lazy/lazy.nvim'
+if not vim.loop.fs_stat(lazypath) then
+  vim.fn.system {
+    'git',
+    'clone',
+    '--filter=blob:none',
+    'https://github.com/folke/lazy.nvim.git',
+    '--branch=stable', -- latest stable release
+    lazypath,
+  }
+end
+vim.opt.rtp:prepend(lazypath)
+
+require('lazy').setup("pluginlist")