Remove gitosis from linked projects

Project seemed to have been abandoned 10 years ago.

Change-Id: I29733c28df783a8f6d23718bed3aae1324d4a474
diff --git a/pages/site/about.md b/pages/site/about.md
index 91b45e1..8fe71af 100644
--- a/pages/site/about.md
+++ b/pages/site/about.md
@@ -30,7 +30,7 @@
 Perforce triggers, Rietveld is strictly advisory and does not enforce
 peer-review prior to submission.
 
-## Gitosis and Gitolite
+## Gitolite
 
 Git is a distributed version control system, wherein each repository
 is assumed to be owned/maintained by a single user.  There are no
@@ -40,13 +40,12 @@
 a single shared repository a high degree of trust is required, as any
 collaborator with write access can alter the repository.
 
-[Gitosis] and [Gitolite] provide tools to secure centralized Git
+[Gitolite] provide tools to secure centralized Git
 repositories, permitting multiple maintainers to manage the same
 project at once, by restricting the access to only over a secure
 network protocol, much like Perforce secures a repository by only
 permitting access over its network port.
 
-[Gitosis]: https://github.com/tv42/gitosis
 [Gitolite]: http://gitolite.com/gitolite/index.html
 
 ## Android