bash: Move the welcome message to /etc

This depends on hashbang/shell-etc#140 being merged

Closes #32

bash/.bash_profile

@@ -1,47 +1,8 @@
 export EDITOR=nano
 export VISUAL=$EDITOR
 
-echo "   _  _    __  ";
-echo " _| || |_ |  |  Welcome to #!. This network has three rules:";
-echo "|_  __  _||  | ";
-echo " _| || |_ |  |  1. When people need help, teach. Don't do it for them";
-echo "|_  __  _||__|  2. Don't use our resources for closed source projects";
-echo "  |_||_|  (__)  3. Be excellent to each other";
-echo "               ";
-echo " Things to explore:";
-echo " ";
-if [ ! -z "$TMUX" ] # check for tmux before displaying tmux help
-then
-  echo "   * You are in a 'tmux' session. There are three tabs below."
-  echo "     Navigate with <Ctrl-b> + a tab number."
-  echo " ";
-  echo "   * You are already in our IRC channel in \"tab 1\""
-  echo "     Type <Ctrl-B> + 1 to reach it and chat with us."
-  echo " ";
-  echo "   * Your system email address is: $USER@hashbang.sh";
-  echo "     Type <Ctrl-B> + 2 to check your email"
-  echo " ";
-  echo "   * You can detach from this tmux session with <Ctrl-b> + <d>"
-  echo "     You can also re-attach outside of tmux with 'tmux attach'"
-else
-  echo "   * You can start 'tmux' to enter a tmux session."
-  echo "     Help will be displayed when tmux is started."
-  echo " ";
-  echo "   * You can resume a detached tmux session at any time."
-  echo "     Use 'tmux attach' to resume your tmux session."
-  echo " ";
-fi
-echo "   * You have public webspace at http://$USER.hashbang.sh";
-echo "     Any files you create in your 'Public' folder will appear there";
-echo " ";
-echo "   * To learn more about us and our offerings type: man hashbang";
-echo " ";
-echo " Like what we're doing? Consider donating to expand our efforts.";
-echo "  * Bitcoin - [ 1DtTvCLiUMhs21QcETQzLyiqxoopUjqBSU ]";
-echo "  * Google Wallet - [ donate@hashbang.sh ]";
-echo "  * PayPal - [ http://goo.gl/aSQWy0 ]";
-echo " ";
-echo " Community shell servers generously sponsored by: (http://atlantic.net)";
+# Source the greetings banner
+[ ! -d "/etc/hashbang" ] || /etc/hashbang/welcome
 
 # make sure this is an interactive session, then start tmux
 [[ $- != *i* ]] && return