Clarify editor documentation for PATH variable and VS Code

[micahellison]

Fixes #1155. There were VS code instructions for Mac and Linux, but not Windows. This unifies the instructions for all OSes since the --wait argument works the same everywhere.

The instructions were also needlessly complicated and revolved around the PATH variable, so I added a preamble paragraph to the editors section about using the PATH variable.

I also moved up the VS Code instructions since they're very similar to Sublime's, and I added a link to Sublime while I was in there.

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
• I have tested this code locally.
• I have checked to ensure there aren't other open pull requests
  for the same issue.
• I have written new tests for these changes, as needed.
• All tests pass.

[wren]

🧇