Replace broken links across various pages

[anisa-hawes]

I'm opening this PR to update various broken links.

Closes #3724

Checklist

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[anisa-hawes]

Hola @jenniferisasi,

The broken links seemed to be multiplying! 😅

I've caught them all (for now!) and I've checked each one in the Preview. Thank you for your support 👐🏼