devcontainer using the wrong user

[liamgreenlee]

The devcontainer was updated in #3 but the extension configurations were not updated with new paths (they're currently set to use /home/vscode). The new user is also root, so new files are created as root and cannot be removed from the host.

[ehsteve]

Thank you for submitting this issue @liamgreenlee! We will look into it and hopefully have a fix soon.

[ehsteve]

@dbarrous this problem is likely true across all of the instrument packages.

[dbarrous]

I have created the above PRs to address this issue. @ehsteve @acrager Whenever you get a chance could you do a review on each of the above, thanks!