Add access and branch panel screenshots

Change-Id: I7e6180c9854e21c020f8dedf037658fb0a4989df
diff --git a/images/access.png b/images/access.png
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diff --git a/images/branches.png b/images/branches.png
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diff --git a/images/project-list.png b/images/project-list.png
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--- a/images/project-list.png
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diff --git a/index.md b/index.md
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--- a/index.md
+++ b/index.md
@@ -41,8 +41,17 @@
 Git clients.  Simplify management by hosting many Git repositories
 together.
 
+|||---||| 6,2,4
+### Navigate projects
 ![project list](images/project-list.png)
 
+### Control access
+![access panel](images/access.png)
+
+## Update branches
+![branch list](images/branches.png)
+|||---|||
+
 Schedule [git gc] over all managed repositories and [replicate] to
 geographical mirrors for latency reduction and backup servers for hot
 spare redundancy.