docs: blog.johnnyreilly.com moved to johnnyreilly.com - updated showcase

[johnnyreilly]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

I've moved to a root domain - just trying to get links updated johnnyreilly/blog.johnnyreilly.com#393

Test Plan

Test links

Deploy preview: https://deploy-preview-8492--docusaurus-2.netlify.app/showcase/?tags=opensource&tags=large&tags=personal

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 93	🟢 97	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 78	🟢 100	🟢 100	🟢 100	🟢 90	Report

[johnnyreilly]

thanks!