Improve YAML formatting for pkgdown

[IndrajeetPatil]

Also rename fileext: yml -> yaml

[codecov-commenter]

Codecov Report

Merging #1042 (381a6e3) into main (305644b) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 381a6e3 differs from pull request most recent head 4484cfb. Consider uploading reports for the commit 4484cfb to get more accurate results

@@           Coverage Diff           @@
##             main    #1042   +/-   ##
=======================================
  Coverage   91.08%   91.08%           
=======================================
  Files          46       46           
  Lines        2691     2691           
=======================================
  Hits         2451     2451           
  Misses        240      240           

Impacted Files	Coverage Δ
R/detect-alignment.R	97.80% <100.00%> (ø)

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[lorenzwalthert]

Did you use a formatter or format manually?

[IndrajeetPatil]

I used VS Code's YAML formatter

[IndrajeetPatil]

@lorenzwalthert Did you need any further clarifications on this PR?

[lorenzwalthert]

No. I was wondering if we should add a pre-commit hook for YAML formatting (and I remembered there weren’t any popularones at the time I checked last time) and I found the there is one by Google now and I might use it in the future (google/yamlfmt#58).

[IndrajeetPatil]

That'd indeed be great!