Little typo+md formatting fixes, codespell config and workflow

[yarikoptic]

Description

Spotted broken markdown, fixed that and did my "let's make a world a better place without typos" adventure. Feel free to ignore/close

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

[netlify[bot]]

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[garrettmflynn]

@yarikoptic Thank you for adding codespell to the repo! Always happy to be introduced to a new tool that makes our repos more clear and cohesive.