add info to readme and example configs about mathjax

README.md

@@ -100,6 +100,7 @@ params:
   disableSummary: false
   copyCodeButton: true # true by default
   rssAsSocialIcon: true
+  mathjax: false # https://www.mathjax.org/
   # utteranc.es support
   utterancesRepo: ""  # mandatory
   utterancesTheme: "" # optional

exampleSite/config.toml

@@ -20,6 +20,7 @@ readMore = false
 readNextPosts = 2
 copyCodeButton = true
 rssAsSocialIcon = true
+mathjax = false
 
 # Graphcomment support
 graphcommentId = ""

exampleSiteMultilingual/config.toml

@@ -22,6 +22,7 @@ readNextPosts = 2
 copyCodeButton = true
 rssAsSocialIcon = true
 locale = "en-us"
+mathjax = false
 
 # Graphcomment support
 graphcommentId = ""