refactor: update codam-header plugin configuration and clean up unused code

feat: nvim-tree and neo-tree fully functional

lua/kickstart/plugins/nvim-tree.lua

@@ -1,16 +0,0 @@
-require('nvim-tree').setup {
-  sort = {
-    sorter = 'case_sensitive',
-    folders_first = true,
-    files_first = false,
-  },
-  view = {
-    width = 30,
-  },
-  renderer = {
-    group_empty = true,
-  },
-  filters = {
-    dotfiles = true,
-  },
-}