refactor(core): optimize App entrypoint, it should not re-render when navigating

[slorber]

Motivation

Minor perf refactor, because usage of useLocation is going to trigger a lot of re-renders whenever a navigation happens.

On a Mac M3 this saves at least 1ms execution time on navigation. I guess on low-end mobile devices the impact on navigation can be more significant.

Test Plan

Nop 😅

Test links

https://deploy-preview-10060--docusaurus-2.netlify.app/

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	d154254
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/66224aff336ec40008094753
😎 Deploy Preview	https://deploy-preview-10060--docusaurus-2.netlify.app
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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 72	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 69	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 74	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 67	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 63	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 71	🟢 100	🟢 100	🟠 80	🟠 88	Report
/blog/tags	🟠 77	🟢 100	🟢 100	🟢 90	🟠 88	Report

[github-actions]

Size Change: +40 B (0%)

Total Size: 1.59 MB

Filename	Size	Change
website/build/assets/js/main.********.js	810 kB	+40 B (0%)

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/codeTranslations.json	2 B
website/.docusaurus/docusaurus.config.mjs	26.7 kB
website/.docusaurus/globalData.json	91.2 kB
website/.docusaurus/i18n.json	930 B
website/.docusaurus/registry.js	247 kB
website/.docusaurus/routes.js	156 kB
website/.docusaurus/routesChunkNames.json	109 kB
website/.docusaurus/site-metadata.json	2.17 kB
website/build/assets/css/styles.********.css	113 kB
website/build/index.html	38 kB

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