refactor!: allow live editing, LuaLS annotations

[DrKJeff16]

Description

I've allowed live editing. Persistent accross sessions and controlled by a buffer-local autocommand.

This closes #2.

Would love your feedback!

[StikyPiston]

Error when trying to run the :Cheaty command:

Lua :command callback: .../lv/site/pack/pckr/opt/cheaty.nvim/lua/cheaty/window.lua:36: attempt to index global 'buffer' (a nil value)
stack traceback:
        .../lv/site/pack/pckr/opt/cheaty.nvim/lua/cheaty/window.lua:36: in function 'create_window'
        .../lv/site/pack/pckr/opt/cheaty.nvim/lua/cheaty/window.lua:89: in function 'toggle'
        ...re/lv/site/pack/pckr/opt/cheaty.nvim/lua/cheaty/init.lua:25: in function <...re/lv/site/pack/pckr/opt/cheaty.nvim/lua/cheaty/init.lua:24>
Press ENTER or type command to continue

[DrKJeff16]

@StikyPiston The merge deleted some of my edits. Re-integrated them.

[StikyPiston]

It works again!

I love the implementation, and also the new title for the window, but I would love to be able to specify the cheatsheet in the init.lua file, as an override if present. If that can be implemented, this'll be an instant merge (assuming no more issues arise)

[DrKJeff16]

but I would love to be able to specify the cheatsheet in the init.lua file, as an override if present.

What do you mean by that exactly?

Upon first launch the file should get the config.cheatsheet data written into it:

https://github.com/DrKJeff16/cheaty.nvim/blob/4251854180fbd030361b9cf9d19fe87a20ea2ba1/lua/cheaty/window.lua#L16-L18

[StikyPiston]

Oh, I had forgotten to actually test it. Sorry!

Ready to merge then, thanks for the contribution!