-Add chapters of any format in _sources from the _build/html folder
-Modify _toc.yml in the _build folder
-Push everything
-Use jupyter-book build physics_book/
-Copy-paste the content of the build folder into docs folder
-Use ghp-import -n -p -f physics_book/_build/html
Usefull links:
List of emojis in hexadeciaml https://www.quackit.com/character_sets/emoji/emoji_v3.0/unicode_emoji_v3.0_characters_all.cfm