[VSCODE] Manifest Generation 2.0

[jgw96]

Tell us about your feature idea

Update Manifest generation to be more automatic.

This issue #2628 started making me think, maybe the way we are doing things now for manifest generation, where the user fills out a form that then generates the JSON for the Web Manifest, is actually making it more complicated than we need.

Do you have an implementation or a solution in mind?

After looking more at how Snippets work in VSCode, I think we could GREATLY simplify the manifest generation by using a Snippet instead of this form. The command would write the manifest.json file and then add the Snippet to the file. This would also solve the issue where there are too many PWABuidler defaults in the manifest that users have to change. Using the VSCode Snippets, the user will be able to fill this out in a guided way.

Have you considered any alternatives?

Updating the UX of the form, but Im still convinced this is actually making things more complicated than they need to be.

[ghost]

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