update docusaurus to 3.7.0

[s-santillan]

Thanks for improving Semgrep Docs 😀

Please ensure

• It builds, all components green
• A technical writer reviews the content or PR

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[khorne3]

I don't know what the neutral tests mean, but it builds and looks fine to me

[s-santillan]

Good call out on specifying what the warnings are. I'll list their broad categories in the order in which they appear:

1. Previously, the build log complained about the .svg files (which are rendered correctly). The warning still appears in 3.7.0.
2. This one is new:

   Resolving 'terser-webpack-plugin/dist/minify' in /opt/build/repo/node_modules/terser-webpack-plugin/dist for build dependencies doesn't lead to expected result '/opt/build/repo/node_modules/terser-webpack-plugin/dist/minify.js', but to '/opt/build/repo/node_modules/terser-webpack-plugin/node_modules/terser-webpack-plugin/dist/minify.js' instead. Resolving dependencies are ignored for this path.
   

   It also doesn't seem to affect the actual serving of pages. But it is weird that it suddenly popped out in Docusaurus 3.7.0.
3. We have a new slew of broken links related to my changes in Supported languages + a few others that have come up over time - I will fix these in a separate PR.