move icons.zsh to internal

internal/p10k.zsh

@@ -27,6 +27,8 @@ if ! autoload -Uz is-at-least || ! is-at-least 5.1; then
   return 1
 fi
 
+source "${__p9k_installation_dir}/internal/icons.zsh"
+
 # For compatibility with Powerlevel9k. It's not recommended to use mnemonic color
 # names in the configuration except for colors 0-7 as these are standard.
 typeset -grA __p9k_colors=(
@@ -249,9 +251,6 @@ function _p9k_parse_ip() {
   return 1
 }
 
-source "${__p9k_installation_dir}/functions/icons.zsh"
-source "${__p9k_installation_dir}/functions/vcs.zsh"
-
 # Caching allows storing array-to-array associations. It should be used like this:
 #
 #   if ! _p9k_cache_get "$key1" "$key2"; then