[build/docs] point all old stash references in docs and makefiles to new github repository

debian/README.source

@@ -18,7 +18,7 @@ of a FreeSWITCH git repository.  You can achieve this with:
 
     aptitude update && aptitude install -y git
     mkdir -p /usr/src/freeswitch
-    git clone https://freeswitch.org/stash/scm/fs/freeswitch.git /usr/src/freeswitch/src
+    git clone https://github.com/signalwire/freeswitch.git /usr/src/freeswitch/src
     cd /usr/src/freeswitch/src
 
 Ensuring you have a clean build directory

debian/bootstrap.sh

@@ -338,8 +338,8 @@ Build-Depends:
  $(debian_wrap "${mod_build_depends}")
 Standards-Version: 3.9.3
 Homepage: https://freeswitch.org/
-Vcs-Git: https://freeswitch.org/stash/scm/fs/freeswitch.git
-Vcs-Browser: https://freeswitch.org/stash/projects/FS/repos/freeswitch/browse
+Vcs-Git: https://github.com/signalwire/freeswitch.git
+Vcs-Browser: https://github.com/signalwire/freeswitch
 
 EOF
 }