Set up WSL Ubuntu dev environment

Install Linux on Windows with WSL
- For WSL 1, install Ubuntu-20.04 distro first (which is WSL 1), then upgrade to Ubuntu-22.04.
Git clone this repo to /mnt/c/Workspaces/github/workspace (note: will change /mnt/c to /c in a later step)
Copy or create symlink from personal .bashrc to $HOME/.bashrc
Run init_setup.sh, which does
- Set up chmod/chown support
- Set up Python, Docker, Git, git_secrets, saml2aws, etc.
- Set symlinks to the corresponding Windows home folders

Useful notes

WSL 1 or WSL 2?
To check current distribution and version: wsl -l -v
To converting your distro from WSL 2 back to WSL 1: wsl --set-version Ubuntu 1
Setup chmod/chown support: use wsl.conf as detailed in Unable to change file permissions on Ubuntu Bash for Windows 10.
Note that the umount/mount approach in Chmod/Chown WSL Improvements does not work (error on re-mounting).
Fixing WSL2 npm issue: "/mnt/c/Program Files/nodejs/npm: /bin/sh^M: bad interpreter" (https://hackmd.io/@badging/wsl2)
```
PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH%
```

Provide feedback