[Feature]: docs: add `vim.pack` instructions when 0.12 comes out

[mrjones2014]

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

nvim 0.12 has built-in vim.pack

Describe the solution you'd like

vim.pack instructions

Describe alternatives you've considered

n/a

Additional context

No response