General jupyter-vim-binding shortcuts (hotkeys)

## `vim mode` and `jupyter mode`

`i` or `enter`: go to vim mode

`shift + esc`: go back to jupyter mode


### vim mode

i: start writing

esc: exit vim editing mode

j: up

k: down

> Everything just peace and fun, it's vim! Have fun!


### jupyter mode

o: create a cell below

shift + o: create a cell above

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j: up

k: down

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dd: delete current cell

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ctrl + 2: convert the cell to markdown cell

2: add `##` before the markdown text

ctrl + 1: convert the cell to code cell

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ctrl + s: save the document


https://github.com/lambdalisue/jupyter-vim-binding