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Disable syntax guessing for PygmentsCodeFences by default

This disables highlighting for fenced code blocks without explicitly specified language. It also introduces a new `PygmentsCodeFencesGuessSyntax` config option (defaulting to false).

To enable syntax guessing again, add the following to your config file: `PygmentsCodeFencesGuessSyntax = true`

This is a breaking change.

--- a/commands/hugo.go

+++ b/commands/hugo.go

@@ -309,6 +309,7 @@

 	viper.SetDefault("DisablePathToLower", false)

 	viper.SetDefault("HasCJKLanguage", false)

 	viper.SetDefault("EnableEmoji", false)

+	viper.SetDefault("PygmentsCodeFencesGuessSyntax", false)

 }

 // InitializeConfig initializes a config file with sensible default configuration flags.

--- a/docs/content/overview/configuration.md

+++ b/docs/content/overview/configuration.md

@@ -126,6 +126,8 @@

     preserveTaxonomyNames:      false

     # filesystem path to write files to

     publishdir:                 "public"

+    # enables syntax guessing for code fences without specified language

+    pygmentsCodeFencesGuessSyntax: false

     # color-codes for highlighting derived from this style

     pygmentsStyle:              "monokai"

     # true: use pygments-css or false: color-codes directly

--- a/helpers/content_renderer.go

+++ b/helpers/content_renderer.go

@@ -35,7 +35,7 @@

 }

 func (renderer *HugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) {

-	if viper.GetBool("PygmentsCodeFences") {

+	if viper.GetBool("PygmentsCodeFences") && (lang != "" || viper.GetBool("PygmentsCodeFencesGuessSyntax")) {

 		opts := viper.GetString("PygmentsOptions")

 		str := html.UnescapeString(string(text))

 		out.WriteString(Highlight(str, lang, opts))

@@ -78,7 +78,7 @@

 }

 func (renderer *HugoMmarkHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string, caption []byte, subfigure bool, callouts bool) {

-	if viper.GetBool("PygmentsCodeFences") {

+	if viper.GetBool("PygmentsCodeFences") && (lang != "" || viper.GetBool("PygmentsCodeFencesGuessSyntax")) {

 		str := html.UnescapeString(string(text))

 		out.WriteString(Highlight(str, lang, ""))

 	} else {