Add Renovate and Prettier configurations and CI script

[kenjonespizza]

Description

I've added a CI pipeline for linting, dependency management (with Renovate), and automated PR creation for formatting code with Prettier. A lot of this setup is highly inspired/taken from Cody and teams work on other templates like https://github.com/sanity-io/template-nextjs-personal-website

What to review

This is my first rodeo working on this type of upgrade. It'd be great if someone with experience can take a looksy and give thoughts or approval of the set.

Things to look at:

• All the .github/workflow files
• .github/renovate.json

Testing

I added this branch to trigger the CI and Prettier workflows. Assuming those run correctly, Testing shoudn't be too hard 😅

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Project	Deployment	Preview	Comments	Updated (UTC)
template-nextjs-clean	Ready	Preview	Comment	Aug 18, 2025 2:13pm

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	eslint-config-next@​15.4.5 ⏵ 15.4.6
	@​types/​react@​19.1.9 ⏵ 19.1.10			+1	+4
	@​tailwindcss/​postcss@​4.1.11 ⏵ 4.1.12			-1
	@​types/​node@​20.19.9 ⏵ 20.19.11				+1
	next@​15.4.5 ⏵ 15.4.6			+1
	tailwindcss@​4.1.11 ⏵ 4.1.12	+1		-1
	eslint@​9.32.0 ⏵ 9.33.0	+1
	@​sanity/​vision@​4.3.0 ⏵ 4.4.1	+1
	sanity@​4.3.0 ⏵ 4.4.1	+1
	@​sanity/​assist@​4.4.7 ⏵ 4.4.8	+1			+1
	@​sanity/​prettier-config@​2.0.1
	next-sanity@​10.0.10 ⏵ 10.0.12	+2			+1

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[RitaDias]

Also, a heads up, it seems that there are some conflicts that need to be solved @kenjonespizza :)

[RitaDias]

There are some conflicts but the code itself looks good!

[kenjonespizza]

Thanks so much, @RitaDias ! I merged in main and made one change (removed unnecessary @sanity/template-validator dependency from package). Ready for re-review :)