Fix sample URL of a git repository

anonscm.alioth.debian.org does not exist, anonscm.debian.org does.

README.md

 For the lazy people like me, here are a few simple scripts to interact with
 gitlab's API and setup projects on Salsa (salsa.debian.org).
 
-* import.sh https://anonscm.alioth.debian.org/git/pkg-foo/bar.git pkg-baz
+* import.sh https://anonscm.debian.org/git/pkg-foo/bar.git pkg-baz
 
   Creates a new project 'bar' in group 'pkg-baz' from an old git repo hosted
-in 'https://anonscm.alioth.debian.org/git/pkg-foo/bar.git'
+in 'https://anonscm.debian.org/git/pkg-foo/bar.git'
 
 * irker.sh foo \#debian-bar