feat(hugo.toml): enable robots.txt and set defaultContentLanguage to 'en' in hugo.toml
chore(markup.toml): update goldmark configuration in markup.toml
chore(params.toml): update description and bundled fields in params.toml
chore(sitemap.toml): update changefreq, filename, and priority in sitemap.toml
chore(params.toml): add website title parameter for better customization
chore(baseof.html): update page title to use the website title parameter
chore(nav.html): update navigation link to use the website title parameter