Overleaf-Workshop Port

[neur1n]

What?
Editing Overleaf projects in NeoVim.

Why?

1. It allows users to edit the overleaf project within the local NeoVim without using sync tools like Dropbox or GitHub.
2. Overleaf's Vim mode has limited functionalities.
3. Syncing with Dropbox/GitHub has a big latency, and may causes problems when fail to access Dropbox/GitHub.
4. Using vscode-neovim in VSCode cannot leverage NeoVim's full power.

Potential existing implementations:
VSCode's version: Overleaf-Workshop.

Potential pitfalls:
Overleaf-Workshop's implementation may depend on some web stack toolkits.