Add rollup-config bugs metadata

[wowsofine]

Summary

• Add the standard bugs.url metadata for @guanghechen/rollup-config.
• Point the issue tracker to the existing guanghechen/node-scaffolds issues page.

Verification

• npm view @guanghechen/rollup-config@6.0.11 name version homepage repository bugs deprecated dist.tarball scripts --json
• metadata smoke check for packages/rollup-config/package.json
• npm pack --dry-run --ignore-scripts ./packages/rollup-config
• npx --yes -p @yarnpkg/cli-dist@3.3.1 yarn install --immutable
• NX_DAEMON=false npx --yes -p @yarnpkg/cli-dist@3.3.1 yarn nx run rollup-config:build
• post-build npm pack --dry-run --ignore-scripts ./packages/rollup-config
• npx --yes -p @yarnpkg/cli-dist@3.3.1 yarn prettier --check packages/rollup-config/package.json
• git diff --check