feat: implement fediverse:creator meta tag option (#24)

* feat: implement fediverse:creator meta tag option

* docs: add fediverse creator tag

Author: stiermid

README.md

@@ -69,6 +69,22 @@ theme_config:
   footer: true # Show/hide site footer (default: true)
 ```
 
+### Fediverse Creator tag
+
+Monoholic supports `fediverse:creator` meta tag:
+
+```yaml
+fediverse_creator: @username@social.example.com
+```
+
+Setting `fediverse_creator` tag appends following tag to the site's header:
+
+```html
+<meta name="fediverse:creator" content="@username@social.example.com">
+```
+
+[See Also](https://docs.joinmastodon.org/user/profile/#attribution)
+
 ### Analytics
 
 Monoholic has built-in support for [GoatCounter](https://www.goatcounter.com/), a privacy-friendly analytics platform. Add your GoatCounter subdomain to `_config.yml`:

_config.yml

@@ -19,6 +19,7 @@ theme_config:
   footer: true # set to false to hide the footer
 
 # goatcounter: mycode # your GoatCounter site code (e.g. mycode.goatcounter.com)
+# fediverse_creator: @example@example.social # this enables author attirbution
 
 plugins:
   - jekyll-feed

_includes/head.html

@@ -2,6 +2,11 @@
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
+
+  {%- if site.fediverse_creator -%}
+    <meta name="fediverse:creator" content="{{ site.fediverse_creator }}">
+  {%- endif -%}
+
   {%- seo -%}
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>