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.