fix(config): use jekyll-seo-tag instead of jekyll-seo

Author: stiermid

_config.yml

@@ -12,7 +12,7 @@ theme: "monoholic"
 
 plugins:
   - jekyll-feed
-  - jekyll-seo
+  - jekyll-seo-tag
 
 # Exclude from processing.
 # The following items will not be processed, by default.