Update docs for hosting stack on docker

[LDannijs]

Summary

Update the documentation of hosting the stack on docker, closes #1295
While testing out hosting the stack for myself i came across some things i wanted to see improved.

Changes

• Update youtube links
• Shuffle around certificates section (better legibility and clearer explanation)
• Overall better distinction between explanation and instructions
• Better step-by-step instructions in configuration section
• Admin id needs to be lowercase
• Add key permission denied to troubleshoot instead of just the text

Notes for Reviewers

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Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.