Update Google Analytics for beta site

The beta site is currently using the same analytics ID as the main set
of Gerrit documentation. Switching to a different ID so we can better
identify users visiting the new site.

Change-Id: I818e49f74e5632105bf1d0fdeb6fa7261ccefc96
diff --git a/jekyll-source/_config.yml b/jekyll-source/_config.yml
index d9b0fdb..22bc15d 100644
--- a/jekyll-source/_config.yml
+++ b/jekyll-source/_config.yml
@@ -21,7 +21,7 @@
 disqus_shortname:
 # if you're using disqus for comments, add the shortname here. if not, leave this value blank.
 
-google_analytics: UA-73551813-1
+google_analytics: UA-107829153-1
 # if you have google-analytics ID, put it in. if not, edit this value to blank.
 
 host: 127.0.0.1