Update readme and license

Author: whyjz

LICENSE.md

@@ -1,4 +1,7 @@
-This work is dual-licensed under the MIT and the Creative Commons Attribution 4.0 International Licenses.
+This work is dual-licensed under the MIT licenses (for code) and the Creative 
+Commons Attribution 4.0 International (for other content) Licenses. Users can
+choose either or both licenses according to which part of the work they seek 
+permission.
 
 Copyright (c) 2016-2021 Whyjay Zheng. All rights reserved.
 

README.md

@@ -1,10 +1,14 @@
+<a href="https://hosted.weblate.org/engage/gmt-tutorials/">
+<img src="https://hosted.weblate.org/widgets/gmt-tutorials/-/svg-badge.svg" alt="翻譯狀態" />
+</a>
+
 # GMT 教學手冊 (GMT Tutorials)
 
+![Banner Logo](SOURCE_DOCS/index_banner_text.png =300x)
+
 [網站 (中文)](http://gmt-tutorials.org)
 [Website (English)](http://gmt-tutorials.org/en/)
 
-![CC-BY](SOURCE_DOCS/by.png)
-
 # 有關於此儲存庫 (About This Repository)
 
 這裡為「GMT 教學手冊」網站的文本檔 (包含文字、腳本、圖片)，除了 README.md 之外，文檔皆以 *re***Structured***Text* 格式撰寫而成，再以 [Sphinx](http://www.sphinx-doc.org/en/stable/index.html) 編譯。
@@ -17,7 +21,6 @@
 This repo hosts the source files (text, scripts, and images) of the website "GMT Tutorials". All the text (expect for the README.md itself) is in *re***Structured***Text* format and is built using [Sphinx](http://www.sphinx-doc.org/en/stable/index.html).
 
 
-
 - `SOURCE_DOCS/xxx.rst`: text file for each chapter (webpage)
 - `SOURCE_DOCS/locale/en/`: English translation files
 - `SOURCE_DOCS/xxx/`: figures, sources for plotting, and the final bash script for each chapter
@@ -76,8 +79,17 @@ bash decorate.bash
 # 完成！ (Finished!!)
 ```
 
+# 授權 (License)
+
+本作品使用 MIT 與 CC BY 4.0 雙授權。更多資訊請參閱 [授權檔案](LICENSE.md)。
+
+This work is dual-licensed under the MIT licenses and the CC BY 4.0 licenses. For more information, please see the [LICENSE file](LICENSE.md).
+
 # 翻譯協作 (How to contribute translation)
 
 如您對翻譯此網站有興趣，歡迎前往在 [Weblate 上公開的專案](https://hosted.weblate.org/projects/gmt-tutorials/) 並隨時開始翻譯。感謝您的貢獻！
 
 If you are interested in translating this website, please come to the [open project on Weblate](https://hosted.weblate.org/projects/gmt-tutorials/) and start translating at any time. Thank you for contributing to this project!
+
+<a href="https://hosted.weblate.org/engage/gmt-tutorials/">
+<img src="https://hosted.weblate.org/widgets/gmt-tutorials/-/multi-auto.svg" alt="翻譯狀態" />