fix: improve sidebar accessibility structure (#8429)

[LassadBoubarma]

This PR addresses issue #8429 by improving the accessibility structure of the documentation sidebar.

Changes Made:

• Replaced the outer <div>/<aside> with a semantic <nav aria-label="docs sidebar">
• Applied aria-hidden="true" to the logo when not intended to be focusable or read
• Cleaned up markup to match accessibility expectations

#Why this is still useful:

Although NVDA did not read the logo before the fix, the original markup was semantically incorrect:

• The outer <aside> was unnecessary and could cause duplicate landmark announcements in some screen readers
• The logo lacked explicit aria-hidden, leaving its behaviour inconsistent across assistive tech

This change makes the sidebar:

• More semantically correct
• More predictable across screen readers
• Closer to WAI-ARIA and a11y best practices

Tested locally with NVDA and DOM inspection.

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🟠 70	🟢 98	🟢 100	🟢 100	Report
/docs/installation	🟠 50	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 71	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 62	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟠 86	Report

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