fix: remove website-generator from prepublishOnly

[azu]

Summary

Fixes npm publish failures by removing website-generator from the prepublishOnly script in textchecker-element package.

Problem

The prepublishOnly script was failing during lerna publish because:

• website-generator was incorrectly included in the publish lifecycle
• The script requires --output-dir flag but was never properly configured
• Website generation is not part of the npm publish flow and should not block package publication

Solution

• Removed npm run website-generator from prepublishOnly script
• Updated website-generator script to use direct path (node ../@textlint/website-generator/bin/cmd.js) for potential future manual use
• prepublishOnly now only runs build:public-lib and build, which are the actual requirements for publishing

Context

The actual deployment flow is:

• Netlify deployment: root website script → textchecker-element website script → vite build
• The website-generator script is separate and not used in deployment
• Package publishing should only require building the distributable files

Test Plan

• Run lerna publish --skip-git --skip-npm from repository root to verify prepublishOnly script succeeds
• Verify build output is generated correctly in lib/ and public-dist/ directories
• Confirm no errors related to missing --output-dir flag
• Check that the package can be published successfully

[github-actions]

📦 NPM Package Status

Published Packages Missing OIDC Configuration

Configure OIDC for these packages:

• @textlint/config-inliner
• @textlint/config-partial-parser
• @textlint/runtime-helper
• @textlint/script-compiler
• @textlint/script-parser
• @textlint/website-generator
• textchecker-element

Setup Instructions:

1. Click each package link above
2. Click "Add trusted publisher"
3. Configure with:
   • Repository: textlint/editor
   • Workflow: .github/workflows/release.yml
   • Environment: npm