Remove multilingual news concept (#69)

config.toml

content/news/index.en.md

content/news/index.zh.md

content/news/the-internet-on-redox.md

content/news/this-summer-in-redox-15.md

content/news/this-week-in-redox-1.md

content/news/this-week-in-redox-10.md

content/news/this-week-in-redox-11.md

content/news/this-week-in-redox-12.md

content/news/this-week-in-redox-13.md

content/news/this-week-in-redox-14.md

content/news/this-week-in-redox-2.md

content/news/this-week-in-redox-3.md

content/news/this-week-in-redox-4.md

content/news/this-week-in-redox-5.md

content/news/this-week-in-redox-6.md

content/news/this-week-in-redox-7.md

content/news/this-week-in-redox-8.md

content/news/this-week-in-redox-9.md

layouts/_default/list.html