Fix broken links in basic-usage.mdx

[justinphilpott]

Description

Fix broken links on: https://astro.cloudinary.dev/getcldimageurl/basic-usage

Links to further docs on Configuration, and Examples are broken at the foot of the page and lead to a blank page.

Issue Ticket Number

Fixes #67

Type of change

• [ x] Fix or improve the documentation

Checklist

• I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• I have created an issue ticket for this PR
• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have run tests locally to ensure they all pass
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

[vercel]

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