docs: update introduction for three.js r155+ #3134
Merged
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If you follow the guidance on the introduction page you end up installing the latest three.js but the code sample was built for the pre-r155 lighting system. The linked codesandbox project has already been updated but the code sample on the page has not. This change aligns the page's code sample with the codesandbox code.
This has tripped a few people up: #3003 #2990 #2963
Before:
After: