Replace echo -e with printf for portable ANSI banners

dash (Debian's /bin/sh) doesn't support echo's -e flag: it prints "-e"
literally as text before processing the rest of the string's backslash
escapes. Every script's colored banner was affected. printf's escape
handling is POSIX-mandated and behaves identically under dash and bash,
so swap all 90 echo -e calls for printf, appending the trailing \n that
echo used to add implicitly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bin/dotfiles.sh

@@ -1,14 +1,14 @@
 #!/bin/sh
 
-echo -e '\033[35m
+printf '\033[35m
     ____        __     _______ __
    / __ \____  / /_   / ____(_) /__  _____
   / / / / __ \/ __/  / /_  / / / _ \/ ___/
  / /_/ / /_/ / /_   / __/ / / /  __(__  )
 /_____/\____/\__/  /_/   /_/_/\___/____/
-\033[0m'
+\033[0m\n'
 #installing better prompt and some goodies
-echo -e "\033[35;1mInstalling shell prompt for current user $USER \033[0m"
+printf "\033[35;1mInstalling shell prompt for current user $USER \033[0m\n"
 sleep 2
 # get the current position
 _cwd="$(pwd)"
@@ -19,4 +19,4 @@ git clone https://figureslibres.io/gitea/bachir/dotfiles-server.git ~/.dotfiles-
 source ~/.bashrc
 # return to working directory
 cd "$_cwd"
-echo -e "\033[92;1mDot files installed for $USER\033[0m"
+printf "\033[92;1mDot files installed for $USER\033[0m\n"