Rearrange all the docs to allow for a docs/major.minor/ setup

_data/translations.yml

@@ -0,0 +1,19 @@
+- name: Chinese
+  code: zh
+  description: Bootstrap 中文文档
+  url: https://v4.bootcss.com/
+
+- name: Chinese
+  code: zh
+  description: Bootstrap 4 中文文档教程
+  url: http://wiki.jikexueyuan.com/project/bootstrap4/
+
+- name: Japanese
+  code: ja
+  description: Bootstrap 4 日本語リファレンス
+  url: http://bootstrap4.jp/
+
+- name: Brazilian Portuguese
+  code: pt-BR
+  description: Bootstrap 4 Português do Brasil
+  url: https://bootstrapbrasil.github.io/v4/