android: Update source control tools reference

Repo URL is outdated and version control is no longer in existence.
Replace both in favour of Source Control Tools page which contains both existing tools
as well as some other useful ones like Gerrit, Android Code Search and more.

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>
Change-Id: Iea66c6001cf8fde6717cb53d4cd5610f63d40043
diff --git a/README.mkdn b/README.mkdn
index d96fa2e..99a305e 100644
--- a/README.mkdn
+++ b/README.mkdn
@@ -4,8 +4,7 @@
 Getting started
 ---------------
 
-To get started with Android/LineageOS, you'll need to get
-familiar with [Repo](https://source.android.com/source/using-repo.html) and [Version Control with Git](https://source.android.com/source/version-control.html).
+To get started with Android/LineageOS, you'll need to get familiar with [Source Control Tools](https://source.android.com/setup/develop).
 
 To initialize your local repository using the LineageOS trees, use a command like this:
 ```