Fixed dead links present in every /second-edition/src file #4331
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Previously every chapter in /second-edition/src had a link to the current version of the book, eg:
[the current version of the book](../appendix-00.html)
However, this is a dead link and does not exist, so I replaced these links with:
[the current version of the book](/src/appendix-00.md)
This is what seems to be the correct link, though if a different page was intended to be linked to then I can change that.