Vscode-docs: Update the image of extensions at the homepage

[stone-zeng]

The following image show hundreds of extensions for VS Code:

However, some of the extensions are outdated. For example, the VSCode-LaTeX has been labeled as DEPRECATED and has been replaced by the new LaTeX (previously called LaTeX workshop) extension. So, please consider to update this image.

[gregvanl]

@auchenberg Looks like we should to a review of this list (also see the deprecated spell checker). If you can come up with a list (based off recommended extensions?), then we can ask @misolori to create a new image.

[misolori]

Would be even better if this list could be dynamically updated (either curated or based on popularity) so we didn't have to worry about updating a static image.

cc @octref

[octref]

If I can get a marketplace API to retrieve the top extensions and their icons, I can dynamically generate these.

[octref]

Otherwise, we should take some time to go through the images. https://github.com/Microsoft/vscode-docs/issues/1822 and there's one for the topmost image at homepage too.

[auchenberg]

I like that idea @misolori, we should pull top 20 extensions from the marketplace ("most popular) which is by install numbers, but at least consistent in product, on marketplace website and our website.

[gregvanl]

The extension image list looks up to date to me. I don't see the Latex extension mentioned in the intial comment and even the Go extension image is refreshed.