* docs: remove most HTML from markdown
using HTML in markdown is not a good practice in general, however some things that exist in HTML do not yet exist in markdown, such as centering a sector of text; therefore `<div align="center"></div>` can not be removed without altering the looks of the README.
* docs(translation): replace as much HTML in markdown files as possible for all translated READMEs under `docs/`
* docs(translation): update all req files mentioned in translated READMEs under `docs/` dir
