Several broken links in JGit section

[rmcloughlin]

There's no existing/similar bug report.

• [x] I have searched the existing issues

This report is about a single actionable bug.

• [x] I'm reporting a single actionable bug

This report is about the ProGit book, version 2, English language.

• [x] This bug is not about a translation or old version

Bug covers book website/pdf

• [x] I confirm the bug is about the book as found on the website/pdf

Problem is present in the Pro Git book on the website?

• [x] This bug also affects the Pro Git book as published on the website.

Which version of the book is affected?

I don't know

Describe the bug:

There are several broken links in the section A2.3 Appendix B: Embedding Git in your Applications - JGit:

• https://www.eclipse.org/jgit/
• https://www.eclipse.org/jgit/download
• https://www.eclipse.org/jgit/documentation

These all lead to 404 pages.

Steps to reproduce:

N/A

Expected behavior:

The links should be up to date.

Screenshots:

No response

Additional context:

No response

Device

No response

Operating system

No response

Browser/application + version

No response