docs(nvim): add documentation for neovim

[Prakhar1808]

Overview

this PR adds documentation for the nvim dotfiles (config)
majorly all keymaps needed to use the nvim config

Screenshot (Preview)

Note For Maintainers

do tell if any changes are to be made or any specific keymaps need to be added or removed

[LilSuperUser]

We need a few changes in the keymap documentation:

• I noticed that you have missed some keymaps that exists in the config. Please add them.
• We should also add a Mode column (to be verbose about what mode the user has to be in to use the keymap
• I noticed one duplicate entry under the General Section, 1st and the 3rd keymaps are same. Adding a column for Mode would fix it.

Lastly, the current structure makes it hard to navigate cause the user would have to scroll a lot to find the desired keymap.

Maybe we should organize it as a webpage or adding an index/table of contents at the top. The main idea is that it should look like a cheatsheet.

Also, I’ve pushed some changes to main, please pull and rebase your branch on top of it.

[Prakhar1808]

thanks for the input, will do!