Fix broken links (external & internal), replace relative with absolute links

Bug report

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Checklist

• This issue is not a duplicate, I've searched the Issue Tracker
• This issue is not a question, I'm aware that I can submit questions via Mastodon, Twitter, Email, Reddit or Matrix
• This issue is a bug report, and not a content request, feature request, or anything other

What is the bug behavior?

1. External links are broken, or redirect
2. Internal links to images are broken following new directory structure
3. Internal links are relative links (../path/to/file.md)

What is the expected correct behavior?

1. External links should work & avoid redirection
2. Images should display correctly
3. Internal links should be absolute links

What are the steps to reproduce the bug?

N/A

What are possible fixes?

1. Identify broken/redirecting external links & fix them
2. Fix broken internal links to images
3. Replace internal relative links with absolute links

Do you have additional comments?

N/A