Move all scripts to 'src' directory

src/list_manual_pkgs.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+# one-liner to list just the names of packages manually-installed with xbps-install, with no version numbers etc
+xbps-query --list-manual-pkgs | sed "s/-[0-9].*//g"
+
+# i originally wrote this using awk, but i realised that sed would allow for a more elegant implementation, although there was no meaningful speed difference during my tests
+# alternative awk version:
+# xbps-query --list-manual-pkgs | awk '{gsub(/-[0-9]+.*$/, ""); print $0}'