Add ArviZ InfData Blog post (#405)

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Co-authored-by: Joe Hamman <jhamman1@gmail.com>

* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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* Update src/posts/introducing-inference-data/index.md

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Co-authored-by: Oriol Abril-Pla <oriol.abril.pla@gmail.com>
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Co-authored-by: Osvaldo A Martin <aloctavodia@gmail.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update index.md

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* Fix up blog post

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Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>
Co-authored-by: Anderson Banihirwe <13301940+andersy005@users.noreply.github.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update index.md

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Co-authored-by: Joe Hamman <jhamman1@gmail.com>

* Add html repr

Copied from `idata._repr_html_()` and removed indents to avoid markdown interpreting parts as code

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* Update index.md

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* move data repr to standalone file

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* Update index.md

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Joe Hamman <jhamman1@gmail.com>
Co-authored-by: Osvaldo A Martin <aloctavodia@gmail.com>
Co-authored-by: Oriol Abril-Pla <oriol.abril.pla@gmail.com>
Co-authored-by: Anderson Banihirwe <13301940+andersy005@users.noreply.github.com>
Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>
Co-authored-by: Anderson Banihirwe <axbanihirwe@ualr.edu>

Author: 7 people