DOC: Update astro comparisons

[FredKSchott]

• Add elder.js comparison
• Add Gatsby comparison
• update perf audit scores (including a lighthouse bump from 95->99 and a JS payload bump from ~7kb to ~70kb

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[RafidMuhymin]

• Add elder.js comparison
• Add Gatsby comparison
• update perf audit scores (including a lighthouse bump from 95->99 and a JS payload bump from ~7kb to ~70kb

Shouldn’t it be from ~70kb to ~7kb?

[FredKSchott]

it's frustrating, but our Algolia-powered search is only available as a React component, so it forces us to add react-render plus the component itself for an additional ~65kb JS. But, we're smarter about loading JS now using client:visible and client:idle so that it doesn't impact overall page performance.