chore: update prettier

[alaister]

What kind of change does this PR introduce?

chore

What is the new behaviour?

• updates prettier
• adds manual script to run prettier (npm run prettier)
• moves prettier files to a separate config
• adds a prettier github action to ensure consistency

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Name	Status	Preview	Comments	Updated (UTC)
dbdev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 29, 2023 7:11am