Add links to YAML cheatsheets

Fix #6054

lib/site_template/_config.yml

@@ -7,12 +7,17 @@
 #
 # For technical reasons, this file is *NOT* reloaded automatically when you use
 # 'bundle exec jekyll serve'. If you change this file, please restart the server process.
-
+#
+# If you need help with YAML syntax, here are some quick references for you: 
+# https://learn-the-web.algonquindesign.ca/topics/markdown-yaml-cheat-sheet/#yaml
+# https://learnxinyminutes.com/docs/yaml/
+#
 # Site settings
 # These are used to personalize your new site. If you look in the HTML files,
 # you will see them accessed via {{ site.title }}, {{ site.email }}, and so on.
 # You can create any custom variable you would like, and they will be accessible
 # in the templates via {{ site.myvariable }}.
+
 title: Your awesome title
 email: your-email@example.com
 description: >- # this means to ignore newlines until "baseurl:"