Indentation fixes

[mrienstra]

What kind of changes does this PR include?

• Minor content fixes (broken links, typos, etc.)

Description

Found and fixed various indentation issues.

Many of these were found using this regex:

^(?!\d+\. +[^ \n])(?!setup: \|)[^ \n].+\n+ {3,}

(could also be written ^(?!\d+\. +[^ \n]|setup: \|)[^ \n].+\n+ {3,})

I changed some tabs to spaces -- when they were located with the regex above -- but I'm leaving the bulk of that work for another PR.

Whenever I was unsure, I looked at other code samples and the withastro/astro codebase to see which formatting conventions are (seemingly) preferred by Astro maintainers.

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