fix(theme-classic): temporarily disable toc heading autoscrolling

[slorber]

Motivation

This change (#6317) led to issues, for which we don't have a perfect solution yet.

Let's disable this temporarily so that next release does not have the bugs, we'll reapply it properly later.

See

• initial PR: feat(theme-classic): autoscroll TOC with active link #6317
• issue: [bug] scroll-behavior: smooth not working together with TOC anchor nav in 2.0.0-beta.15 #6620
• fix attempt: feat(theme-classic): reintroduce autoscrolling TOC #6666

Have you read the Contributing Guidelines on pull requests?

yes

Test Plan

preview, basic revert

[netlify]

✔️ [V2]

🔨 Explore the source changes: ec87470

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/62165b987d4df00007fe06ec

😎 Browse the preview: https://deploy-preview-6748--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	54
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-6748--docusaurus-2.netlify.app/

[github-actions]

Size Change: -36 B (0%)

Total Size: 782 kB

Filename	Size	Change
website/build/assets/js/main.********.js	591 kB	-36 B (0%)

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	48 kB
website/build/assets/css/styles.********.css	106 kB
website/build/index.html	37.6 kB

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