[DOC] - Add docs on using local VS Code to remote tunnel into Nebari Jupyterlab

[kcpevey]

Preliminary Checks

• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/nebari-dev/nebari/discussions

Summary

We have docs on how to SSH into Nebari - https://www.nebari.dev/docs/how-tos/connect-via-ssh#connect-to-nebari-via-ssh . These work for the terminal in jlab, but they dont work for making a remote SSH connection to VSCode.

The instructions for connecting (via remote tunnel) a local VSCode instance to the remote JLab server are:

1. Download the vscode CLI for Linux x64 and upload to Nebari. The Code CLI is built into the desktop version, but you can just download the lighter CLI only. https://code.visualstudio.com/Download . For those who are particularly trusting, here is the shortcut: curl -LO https://code.visualstudio.com/sha/download?build=stable&os=cli-alpine-x64 .
2. Unpack it tar -xf vscode_cli.tar.gz
3. Add it to your system PATH in your ~/.bash_profile, e.g. export PATH="/path/to/codefolder:$PATH"
4. Source the updated ~/.bash_profile or get a new terminal
5. Follow the instructions here -https://code.visualstudio.com/docs/remote/tunnels#_using-the-code-cli

• In the Nebari terminal, run code tunnel
• Select github account for authentication and follow the instructions: To grant access to the server, please log into https://github.com/login/device and use code XXXX-XXXX.
• Give your Nebari machine a name
• It will output a URL to give you browser access from your local machine https://vscode.dev/tunnel/
• On your local machine, open VSCode and install the Remote - Tunnels extension from Microsoft
• On your local VSCode, click the "Accounts" button on the bottom left of VSCode.
• Select "Turn on Remote Tunnel Access" and follow the prompts, authenticating to Github again.
• Then Connect to Remote Tunnel and select

Theoretically most of this is discoverable by following https://code.visualstudio.com/docs/remote/tunnels#_using-the-code-cli but users don't know that SSH doesn't work with VSCode on Nebari but Remote tunneling does and this write up is much easier to follow (at least for me).