SEO: Gemfile: add each gem details

Author: diamant3

Diff for: Gemfile

@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
-gem "jekyll"
-gem "just-the-docs"
-gem "jekyll-seo-tags"
-gem "jekyll-github-metadata"
-gem "jekyll-include-cache"
-gem "jekyll-sitemap"
+gem "jekyll" # static site generator used
+gem "just-the-docs" # Jekyll theme used
+gem "jekyll-seo-tags" # adds SEO metadata to improve search engine visibility
+gem "jekyll-github-metadata" # fetches repo data for use in Jekyll
+gem "jekyll-include-cache" # caches included files to speed up site gen or load
+gem "jekyll-sitemap" # generate sitemap to help search engines index the site