chore: Update Issue+PR Templates / add SECURITY.md

[atilafassina]

resolve #1731

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More templates

• example-basic
• example-bare
• example-experiments
• example-hackernews
• example-notes
• example-todomvc
• example-with-auth
• example-with-authjs
• example-with-drizzle
• example-with-mdx
• example-with-prisma
• example-with-solid-styled
• example-with-tailwindcss
• example-with-trpc
• example-with-unocss
• example-with-vitest

npm i https://pkg.pr.new/@solidjs/start@1732

commit: 29510e9