fix(content-blog): remove double leading slash in blog-only paginated view

[heowc]

Motivation

Fix #6917

Have you read the Contributing Guidelines on pull requests?

Test Plan

Related PRs

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[netlify]

✔️ [V2]
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🔨 Explore the source changes: bf69b23

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😎 Browse the preview: https://deploy-preview-6918--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	57
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-6918--docusaurus-2.netlify.app/

[heowc]

I signed the CLA. 🤣

[Josh-Cena]

Yeah, no worries. It would be updated within a few hours.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[Josh-Cena]

Beacons are lit. Thanks a lot!