Add pydata-sphinx-theme blog example

[jarrodmillman]

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[stefanv]

Need to:

1. Add layout or type metadata to blog post that is outside of either /posts or /blog.
2. Use correct metadata fields (ours are a bit different from theirs, in that we use authors, tags is a list, and we only use tags (no categories).
3. Document how to add /blog / /posts (easy, just put posts in there, as well as _index.md files for each subdirectory---see blog.scientific-python.org as an example), or elsewhere (harder, need to use the layout or type metadata).

[stefanv]

type: posts

seems to do the trick, both for _index.md files and blog post entries.

[stefanv]

Also document that:

disableKinds: ["term", "taxonomy"]

In config.yaml would prevent tags from rendering; ensure term is not in there.

[stefanv]

We may want to allow post here as well, just so this reads more naturally. Currently, it's basically "the type of this page is the same as if it were in the posts category", but would be more logical to say "the type of this page is a post".