refactor: migrate theme configuration to TOML

exampleSite/config/_default/config.toml

@@ -0,0 +1,19 @@
+# Change baseurl before deploy
+baseurl = "https://demo.stack.jimmycai.com"
+languageCode = "en-us"
+paginate = 5
+title = "Hugo Theme Stack Starter"
+
+# Theme i18n support
+# Available values: ar, bn, ca, de, el, en, es, fr, hu, id, it, ja, ko, nl, pt-br, th, uk, zh-cn, zh-hk, zh-tw
+DefaultContentLanguage = "en"
+
+# Set hasCJKLanguage to true if DefaultContentLanguage is in [zh-cn ja ko]
+# This will make .Summary and .WordCount behave correctly for CJK languages.
+hasCJKLanguage = false
+
+# Change it to your Disqus shortname before using
+disqusShortname = "hugo-theme-stack"
+
+# GA Tracking ID
+googleAnalytics = ""