refactor: remove pygments and other properties that are already default

[SayakMukhopadhyay]

Updated hugo.yaml removing some properties which are deprecated and or the same as the defaults.

• Remove pygments in config which closes Remove pygments from hugo config file #560 which includes pygmentsCodeFences, pygmentsUseClasses, pygmentsUseClassic, pygmentsStyle.
• Remove enableGitInfo as false is the default, see https://gohugo.io/getting-started/configuration/#enablegitinfo
• Remove defaultContentLanguage as en is the default, see https://gohugo.io/getting-started/configuration/#defaultcontentlanguage
• Remove defaultContentLanguageInSubdir as false is the default, see https://gohugo.io/getting-started/configuration/#defaultcontentlanguageinsubdir
• Remove imaging.quality as 75 is the default, see https://gohugo.io/content-management/image-processing/#quality
• Remove imagine.anchor as smart is the default, see https://gohugo.io/content-management/image-processing/#anchor
• Remove privacy_policy as an empty string does the same thing as not having the property
• Remove version_menu, archived_version, version as the site is not versioned.
• Remove algolia_docsearch and offlineSearch as only 1 method of searching can be enabled and Algolia search and offline search is disabled by default. See https://github.com/google/docsy/blob/e6d94771f3376c1f5f96c3be3f01759b529cdc8d/layouts/partials/head.html#L60 and https://www.docsy.dev/docs/adding-content/search/
• Remove breadcrumb_disable as false is the default. Breadcrumbs are enabled by default see https://www.docsy.dev/docs/adding-content/navigation/#breadcrumb-navigation
• Remove sidebar_search_disable as false is the default. Sidebar search is enabled by default see https://www.docsy.dev/docs/adding-content/search/#disabling-the-sidebar-search-box
• Remove navbar_logo as true is the default. Navbar logo is enabled by default see https://www.docsy.dev/docs/adding-content/iconsimages/#add-your-logo
• Use YAML references in languages.en.title as its already defined in title.
• Add markup.highlight.style as emacs to make the style the same as k8s.io. Although nothing is using highlight shortcode in the site right now.

[k8s-ci-robot]

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