Add new entry to FAQ.org (emacs-dashboard#525)

* Fix emacs-dashboard#471

dashboard-replace-displayable doesn't return nerd-icon string due apparently internal-char-font only return non-nil if it is only
displayable with current frame font, this is a problem to some user that doesn't using any nerd patched font as default, also due nerd-font can use any character for its icons it's necessary return string if nerd-icons is avalaible.
The same applies to all-the-icons

This may close: emacs-dashboard#471 and emacs-dashboard#467

* Fix insert-startupify-list failing with cons cells

* Add new entry to FAQ.org

Due Windows port doesn't handle well with icons in dashboard,
I think it's good idea add a new entry into FAQ file about How
to fix this issue.

I've also improve it a little.

docs/FAQ.org

@@ -1,6 +1,6 @@
-* Frequently Asked Questions
+#+title: Frequently Asked Questions
 
-** /How can i hide modeline in dashboard?/
+* /How can i hide modeline in dashboard?/
 
 You can add this to your config:
   #+begin_src emacs-lisp
@@ -19,7 +19,20 @@ For doom-modeline users you may use this:
   (add-to-list 'doom-modeline-mode-alist '(dashboard-mode))
 #+end_src
 
-** /How can i use [[https://github.com/hlissner/emacs-solaire-mode][solaire-mode]] with dashboard?/
+* /Icons doesn't display in Windows GUI, How can i fix it?/
+Emacs Windows port doesn't handle well icons.
+
+For *nerd-icons* you can use *patched nerd fonts* found in their official
+website [[https://www.nerdfonts.com/font-downloads]].
+
+Otherwise you can use *UTF-8* coding system, putting this line into
+your =early-init.el=
+#+begin_src emacs-lisp
+  (if (eq system-type 'windows-nt)
+      (prefer-coding-system 'utf-8))
+#+end_src
+
+* /How can i use [[https://github.com/hlissner/emacs-solaire-mode][solaire-mode]] with dashboard?/
 
 Add this to your config:
 #+begin_src emacs-lisp
@@ -31,7 +44,7 @@ Add this to your config:
 #+end_src
 
 
-** /How can i add my custom widget?/
+* /How can i add my custom widget?/
 
 To add your own custom widget is pretty easy, define your widget's callback function and add it to `dashboard-items` as such:
 #+BEGIN_SRC elisp
@@ -57,19 +70,19 @@ If you want to add an icon to a custom widget, insert it with `dashboard-insert-
 #+END_SRC
 
 
-** Items length is too high How can i change it
+* Items length is too high How can i change it
 You can change dashboard-items-default-length amount:
 #+BEGIN_SRC elisp
   (setq dashboard-items-default-length 20)
 #+END_SRC
 
-** /How can i change dashboard buffer name?/
+* /How can i change dashboard buffer name?/
 You can change it with ~dashboard-buffer-name~
 #+begin_src emacs-lisp
   (setq dashboard-buffer-name "*my dashboard*")
 #+end_src
 
-** /I don't like banner, init info or even items, How can i delete them from dashboard?/
+* /I don't like banner, init info or even items, How can i delete them from dashboard?/
 
 You can delete them from ~dashboard-startupify-list~.
 #+begin_src emacs-lisp
@@ -79,14 +92,14 @@ You can delete them from ~dashboard-startupify-list~.
                                     dashboard-insert-footer))
 #+end_src
 
-** /How can i change my init message?/
+* /How can i change my init message?/
 
 You can customize it like this:
 #+BEGIN_SRC elisp
   (setq dashboard-init-info "This is an init message!")
 #+END_SRC
 
-** /How can i change footer messages?/
+* /How can i change footer messages?/
 
 You can customize it like this:
 #+BEGIN_SRC elisp