Updated VS Code extension instructions

[barnabywalters]

• Removed link to roipoussiere extension, warned against it.
• Added link to OCP CAD Viewer, with explanation that it handles cadquery installation itself

[codecov]

Codecov Report

Merging #1289 (345a3f3) into master (2d35517) will not change coverage.
The diff coverage is n/a.

❗ Current head 345a3f3 differs from pull request most recent head b0a8b54. Consider uploading reports for the commit b0a8b54 to get more accurate results

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[jmwright]

@adam-urbanczyk @lorenzncode Any objection to merging this?

[lorenzncode]

Thanks @barnabywalters for highlighting the problematic link.

Based on #1291 though the README should cover the jupyter lab support and CQ-editor interfaces. I started on #1305 as a potential solution.

[adam-urbanczyk]

Handled in #1305