Continue sync translated articles to upstream GNU.org website.

Fixed a lot of bugs, include cross references, and Readthedocs building.

Thanks all of contributors who made this book awesome!

Free Software, Free Society (3rd) Chinese translation (2019)

2018.3 Release

Free Software, Free Society (3rd) Chinese translation (2018.2)

Remove the \newpage in the source files.

Merge pull request #161 from Hagb/master

修改错字

Final Rlease!

Release Candidate 5

Release Candidate 4

Maybe the last RC revision before offical release.

Release Candidate 3

Release Candidate 2