Remove old gitk section

Author: ben

en/book/02-git-basics/chapter2.asc

@@ -616,16 +616,6 @@ For example, if you want to see which commits modifying test files in the Git so
 
 Of the nearly 20,000 commits in the Git source code history, this command shows the 6 that match those criteria.
 
-==== Using a GUI to Visualize History
-
-If you like to use a more graphical tool to visualize your commit history, you may want to take a look at a Tcl/Tk program called gitk that is distributed with Git. Gitk is basically a visual `git log` tool, and it accepts nearly all the filtering options that `git log` does. If you type gitk on the command line in your project, you should see something like <<gitk_visualizer>>.
-
-[[gitk_visualizer]]
-.The gitk history visualizer.
-image::images/18333fig0202-tn.png[The gitk history visualizer.]
-
-You can see the commit history in the top half of the window along with a nice ancestry graph. The diff viewer in the bottom half of the window shows you the changes introduced at any commit you click.
-
 === Undoing Things
 
 At any stage, you may want to undo something. Here, we’ll review a few basic tools for undoing changes that you’ve made. Be careful, because you can’t always undo some of these undos. This is one of the few areas in Git where you may lose some work if you do it wrong.