Release v6.0.0 · kaiiiz/hugo-theme-monochrome

Minimum Hugo version requirement is now 0.158.0.
languageCode and languageName config keys are deprecated. Use locale and label instead:
```
# hugo.toml
locale = "en"    # was: languageCode = "en"

# languages.toml
[en]
label = "English"  # was: languageName = "English"
locale = "en"      # was: languageCode = "en"
```
The following template variables are also affected:
- .Language.LanguageCode → .Language.Locale
- .Language.LanguageName → .Language.Label
- .Site.Language.LanguageName → .Site.Language.Label
author parameter is now an object supporting name and email properties. If you were using author as a plain string, migrate to the object format:
- Site config (params.toml):
```
author.name = "author name"
author.email = "author@email"
```
- Page front-matter:
```
author:
  name: "author name"
  email: "author@email"
```

Add alternative link supports (<link rel="alternate">) in HTML <head>. (#85)
Per-page author.email support
- author.email is used only in RSS feed tags (<author>, <managingEditor>, <webMaster>) to follow RSS 2.0 specification.
- The HTML SEO <meta name="author"> tag only includes the name, not including the email.
- If only name is set on a page, email falls back to site config, and vice versa.

RSS <author>, <managingEditor>, <webMaster> tags can now be overridden by page front matter author. The tag is omitted entirely if no author info is available; otherwise it renders the best available combination:
- email (name) — when both are provided
- email — when only email is provided
- name — when only name is provided
- Fallback chain: page [author] > site [params.author]

RSS description no longer contains raw chunk HTML tags that were visible in feeds.

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