markdown: Pass emoji codes to yuin/goldmark-emoji

Removes emoji code conversion from the page and shortcode parsers. Emoji
codes in markdown are now passed to Goldmark, where the goldmark-emoji
extension converts them to decimal numeric character references.

This disables emoji rendering for the alternate content formats: html,
asciidoc, org, pandoc, and rst.

Fixes #7332
Fixes #11587
Closes #11598

markup/goldmark/convert.go

@@ -28,6 +28,7 @@ import (
 	"github.com/gohugoio/hugo/markup/converter"
 	"github.com/gohugoio/hugo/markup/tableofcontents"
 	"github.com/yuin/goldmark"
+	emoji "github.com/yuin/goldmark-emoji"
 	"github.com/yuin/goldmark/ast"
 	"github.com/yuin/goldmark/extension"
 	"github.com/yuin/goldmark/parser"
@@ -149,6 +150,10 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 		extensions = append(extensions, c)
 	}
 
+	if pcfg.Conf.EnableEmoji() {
+		extensions = append(extensions, emoji.Emoji)
+	}
+
 	if cfg.Parser.AutoHeadingID {
 		parserOptions = append(parserOptions, parser.WithAutoHeadingID())
 	}
@@ -156,6 +161,7 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 	if cfg.Parser.Attribute.Title {
 		parserOptions = append(parserOptions, parser.WithAttribute())
 	}
+
 	if cfg.Parser.Attribute.Block {
 		extensions = append(extensions, attributes.New())
 	}