Remove next-starter-template

[kale-stew]

Temporarily deprecate next-starter-template

[github-actions]

Dashboard preview link

[github-actions]

template	name	version	latestVersion	isDevDependency
next-starter-template	next	14.2.26	15.3.3	false
next-starter-template	react	18.3.1	19.1.0	false
next-starter-template	react-dom	18.3.1	19.1.0	false
next-starter-template	@opennextjs/cloudflare	1.0.0-beta.3	1.3.0	true
next-starter-template	@types/node	22.15.19	24.0.1	true
next-starter-template	@types/react	18.3.12	19.1.8	true
next-starter-template	@types/react-dom	18.3.1	19.1.6	true
next-starter-template	eslint	8.56.0	9.29.0	true
next-starter-template	eslint-config-next	14.2.5	15.3.3	true
next-starter-template	postcss	8.5.3	8.5.5	true
next-starter-template	tailwindcss	3.4.17	4.1.10	true
next-starter-template	wrangler	4.16.1	4.20.0	true