Make sure Id for NodeDocComponent is unique

Before, this generated the same Id for any component that had the same content no matter the tag or attributes, which leads to problems with empty components: <ColorCard color="#FF00000"></ColorCard> and <TableOfContents></TableOfContents> got the same Id. Adding the position to the string to be hashed ensures uniqueness.

internal/ddt/node_doc_component.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"regexp"
 	"strings"
+	"strconv"
 )
 
 const (
@@ -32,6 +33,7 @@ func (c *NodeDocComponent) Id() string {
 	cleaner := regexp.MustCompile(`\s`)
 
 	content := strings.ToLower(cleaner.ReplaceAllString(c.RawInner, ""))
+	content += strconv.Itoa(c.Position)
 	return fmt.Sprintf("%x", sha1.Sum([]byte(content)))
 }