State vector observable

By mistake, state vector outputs were omitted from the *.toml, even though the implementation would support them. This release simply updates the *.toml to enable state vector outputs.

What's Changed

• Added state to the list of supported measurements in device config. by @mehrdad2m in #22
• Fix tutorial thumbnail image in docs by @josh146 in #21

New Contributors

• @mehrdad2m made their first contribution in #22
• @josh146 made their first contribution in #21

Full Changelog: v0.7.3...v0.8.0

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