Adjust `.vscode` ignores in `.gitignore`

[jorgenherje]

Adjust the ignore-setting in .gitignore regarding VSCode.

Various developers might prefer different settings, extensions, launch-files, etc. for VSCode.

This is done for webviz-config and webviz-subsurface-components.

Thereby consider removing:

.vscode/*
!.vscode/settings.json
!.vscode/tasks.json
!.vscode/launch.json
!.vscode/extensions.json

And replace with simple:

.vscode/