chore: add more sensible defaults for icons

adds a symlink and default icon by default
fixes #1192

README.md

@@ -62,8 +62,8 @@ let g:nvim_tree_show_icons = {
 " default will show icon by default if no icon is provided
 " default shows no icon by default
 let g:nvim_tree_icons = {
-    \ 'default': "",
-    \ 'symlink': "",
+    \ 'default': "",
+    \ 'symlink': "",
     \ 'git': {
     \   'unstaged': "✗",
     \   'staged': "✓",

doc/nvim-tree-lua.txt

@@ -608,8 +608,8 @@ You can set icons for:
 - Symlinks. If an icon is not provided, the `default` icon is used.
 >
   let g:nvim_tree_icons = {
-      \ 'default':        "",
-      \ 'symlink':        "",
+      \ 'default':        "",
+      \ 'symlink':        "",
       \ 'git': {
       \   'unstaged':     "✗",
       \   'staged':       "✓",

lua/nvim-tree/renderer/icon-config.lua

@@ -3,8 +3,8 @@ local M = {}
 function M.get_config()
   local show_icons = vim.g.nvim_tree_show_icons or { git = 1, folders = 1, files = 1, folder_arrows = 1 }
   local icons = {
-    default = "",
-    symlink = "",
+    default = "",
+    symlink = "",
     git_icons = {
       unstaged = "✗",
       staged = "✓",