Update JGit links to new Eclipse project URLs

The previous JGit links lead to 404 page not found.

This was [reported over in the git-scm.com repository](git/git-scm.com#2044), and to my utter disappointment the reporter not only did a shoddy job at reporting it there, not only a shoddy job of saying "I cannot find the correct location" instead of typing in "jgit" in the search page that is _linked directly from the 404 page_. And of course the reporter deemed it totally beneath himself to contribute the fix.

Sometimes I am not happy in the open source world. Most people there are nice. But not all of them.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

book/B-embedding-git/sections/jgit.asc

@@ -3,7 +3,7 @@
 (((jgit)))(((Java)))
 If you want to use Git from within a Java program, there is a fully featured Git library called JGit.
 JGit is a relatively full-featured implementation of Git written natively in Java, and is widely used in the Java community.
-The JGit project is under the Eclipse umbrella, and its home can be found at https://www.eclipse.org/jgit/[^].
+The JGit project is under the Eclipse umbrella, and its home can be found at https://projects.eclipse.org/projects/technology.jgit[^].
 
 ==== Getting Set Up
 
@@ -22,7 +22,7 @@ Probably the easiest is to use Maven – the integration is accomplished by addi
 The `version` will most likely have advanced by the time you read this; check https://mvnrepository.com/artifact/org.eclipse.jgit/org.eclipse.jgit[^] for updated repository information.
 Once this step is done, Maven will automatically acquire and use the JGit libraries that you'll need.
 
-If you would rather manage the binary dependencies yourself, pre-built JGit binaries are available from https://www.eclipse.org/jgit/download[^].
+If you would rather manage the binary dependencies yourself, pre-built JGit binaries are available from https://projects.eclipse.org/projects/technology.jgit/downloads[^].
 You can build them into your project by running a command like this:
 
 [source,console]
@@ -155,6 +155,6 @@ Many other commands are available through the Git class, including but not limit
 This is only a small sampling of JGit's full capabilities.
 If you're interested and want to learn more, here's where to look for information and inspiration:
 
-* The official JGit API documentation can be found at https://www.eclipse.org/jgit/documentation[^].
+* The official JGit API documentation can be found at https://help.eclipse.org/latest/topic/org.eclipse.egit.doc/help/JGit/User_Guide/User-Guide.html[^].
   These are standard Javadoc, so your favorite JVM IDE will be able to install them locally, as well.
 * The JGit Cookbook at https://github.com/centic9/jgit-cookbook[^] has many examples of how to do specific tasks with JGit.