chore: clean up old spectacle mdx links

[Burnett2k]

Description

As part of marking spectacle-mdx-loader repository as read-only, I went through and audited our links within spectacle monorepo which pointed to the old repo or were out of date.

I also fixed some of the formidable.com links as well.

Once we publish this, the URL shown in npm for spectacle-mdx-loader should hopefully update to point to the monorepo instead. (it currently still points to the old repo)

Fixes # (issue)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

verified links are good

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Latest commit: 95602f3

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Name	Status	Preview	Comments	Updated (UTC)
spectacle-docs-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 13, 2024 6:35pm