fix: solve #31 and add bilibili info for credits

[monetjoe]

For solution of issue 31, please refer https://www.bilibili.com/video/BV1FW4y1Q7Dj Commits include:

1. add a js file called preload.js to carry logic for solving issue 31;
2. add a new contributor(me) with info and avater;
3. update credits.rawiconurl.json format;
4. add list.json(generated from credits.rawiconurl.json by shell) to show credits on UI;
5. deprecate multiLangMutation;
6. add bilibili icon svg with href for credits;
7. update LANGUAGES format and datatype;
8. replace cacheStaticObj with base64;
9. clean some synatx warnings and refine readme and code format;