Add pydata-sphinx-theme blog example

Author: jarrodmillman

doc/content/examples/blog/_index.md

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+---
+title: Blog
+---

doc/content/examples/blog/post1.md

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+---
+blogpost: true
+date: Jan 01, 2022
+author: pydata
+location: World
+category: Manual
+tags: one, two, three
+language: English
+---
+
+# Post one with a long-ish title we can use to compare
+
+Here's some text for post 1!
+
+## Post 1 section
+
+Some more text for post 1's section

doc/content/examples/blog/post2.md

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+---
+blogpost: true
+date: Jan 02, 2022
+author: jupyter
+location: World
+category: Manual
+tags: one, two, three, four, five, six
+language: English
+---
+
+# Post title 2 with a longer title to compare in the UI
+
+Here's some text for post 2!
+
+## Post 2 section
+
+Some more text for post 2's section

doc/content/examples/blog/post3.md

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+---
+blogpost: true
+date: Jan 03, 2022
+author: jupyter
+location: World
+category: Manual
+tags: one, two, three, four, five, six, seven, eight, nine
+language: English
+---
+
+# Post three with a long-ish title we can use to compare
+
+Here's some text for post 3!
+
+## Post 3 section
+
+Some more text for post 3's section