_config.yml: Optimize tagline and description for jekyll-seo-tag

_config.yml

@@ -14,9 +14,9 @@
 # You can create any custom variable you would like, and they will be accessible
 # in the templates via {{ site.myvariable }}.
 title: Just the Class
-description: A Jekyll template for course websites.
+tagline: A Jekyll template for course websites
+description: A modern, highly customizable, responsive Jekyll template for course websites
 author: Kevin Lin
-email: me@example.com
 baseurl: '/just-the-class' # the subpath of your site, e.g. /blog
 url: 'https://kevinl.info' # the base hostname & protocol for your site, e.g. http://example.com
 exclude: ["Gemfile", "Gemfile.lock", "LICENSE", "README.md"]