feat: Adds support for superscript in help center articles (#7279)

- Adds support for superscript when rendering article markdown
- Chatwoot Markdown Render to render markdown everywhere

Co-authored-by: Sojan <sojan@pepalo.com>

lib/chatwoot_markdown_renderer.rb

@@ -0,0 +1,26 @@
+class ChatwootMarkdownRenderer
+  def initialize(content)
+    @content = content
+  end
+
+  def render_message
+    html = CommonMarker.render_html(@content)
+    render_as_html_safe(html)
+  end
+
+  def render_article
+    superscript_renderer = SuperscriptRenderer.new
+    doc = CommonMarker.render_doc(@content, :DEFAULT)
+    html = superscript_renderer.render(doc)
+
+    render_as_html_safe(html)
+  end
+
+  private
+
+  def render_as_html_safe(html)
+    # rubocop:disable Rails/OutputSafety
+    html.html_safe
+    # rubocop:enable Rails/OutputSafety
+  end
+end

lib/superscript_renderer.rb

@@ -0,0 +1,28 @@
+class SuperscriptRenderer < CommonMarker::HtmlRenderer
+  def text(node)
+    content = node.string_content
+
+    # Check for presence of '^' in the content
+    if content.include?('^')
+      # Split the text and insert <sup> tags where necessary
+      split_content = parse_sup(content)
+      # Output the transformed content
+      out(split_content.join)
+    else
+      # Output the original content
+      out(escape_html(content))
+    end
+  end
+
+  private
+
+  def parse_sup(content)
+    content.split(/(\^[^\^]+\^)/).map do |segment|
+      if segment.start_with?('^') && segment.end_with?('^')
+        "<sup>#{escape_html(segment[1..-2])}</sup>"
+      else
+        escape_html(segment)
+      end
+    end
+  end
+end