Add partial decorators for better composability

[agriyakhetarpal]

This PR introduces partial decorators, a new feature in Hugo released with v0.154.0: https://github.com/gohugoio/hugo/releases/tag/v0.154.0. This will not be a user-facing change. The documentation is at https://gohugo.io/functions/templates/inner/ and is currently a bit sparse, but still understandable. From the docs: I have bumped to Hugo 0.155.0 with this PR, which is as far as we can go right now.

A partial decorator is a partial template called from any other template including shortcodes, render hooks, and other partials.

There are some more examples here: gohugoio/hugoDocs#3330.

I also tried to add something to deduplicate the grid of items and cards, but that turned out to be more complicated – the content inside needs access to outer variables such as $card and .body. I think we can go ahead with this, for now at least, since it's a net win for easy deduplication either way, and we can do this kind of work incrementally.

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[stefanv]

I like the direction this is taking 👍

[stefanv]

Also, it's neat that Hugo finally added that feature!

[agriyakhetarpal]

I spent some time thinking about what can be done here, since the author of the Atom feed is unresponsive to PRs (and that is unfortunate as is). I think I have a solution, which is simply that we just shouldn't bump to Hugo 0.157.0 here – we should only bump to Hugo 0.155.0, and that will allow us to have a cleaner separation of concerns.

This way, this PR can now be merged without messing with the Atom feed theme. That theme being broken is a consequence of upgrading to Hugo 0.156.0 and later, which removed the site.Author field. I'll create a separate issue about what we can do for the Hugo 0.156.0 update and add some context there. As it stands, this PR is now unblocked.

[agriyakhetarpal]

Could you PTAL now, @stefanv? The diff is much smaller, and the PR should be far easier to digest!