Create new guidance that uses Visual Studio Code for everything

[vickytnz]

Visual Studio Code is a tool that has the potential to be the:

• text editor for code
• terminal for doing commands (this can be done in the application)
• git editor including connecting to Github (though pull requests need a separate plugin to properly work)

This will also mean that we have guidance that works for Codespaces (what people can use if they cannot install anything on their laptop).

Changing this will mean updating the:

1. install guide
2. basic prototype tutorial
3. github and github desktop tutorial - this will need a lot of rework as Github Desktop hides some terms like staging that are made visible again with Visual Studio Code

[vickytnz]

Note from experience using Visual Studio Code:

• the Github connection needs to be with SSH, otherwise it can break badly and pull requests won't work. The easiest way to fix this is to use the terminal command gh auth login, choose GitHub.com and SSH and follow the instructions
• changing branches is at the very bottom left
• the first time of using GitHub with visual studio code it will ask about staging code and if to ignore. this is hidden language in GitHub desktop, easiest to say 'yes'
• adding the GitHub Pull Requests extension helps with doing Pull Requests (though some stuff still needs to be done on the web).