sync: randomize imports: themes order, MCQ and UCQ choices

admin/sync/themes.go

@@ -2,6 +2,7 @@ package sync
 
 import (
 	"fmt"
+	"math/rand"
 	"path"
 	"regexp"
 	"strings"
@@ -54,6 +55,10 @@ func SyncThemes(i Importer) []string {
 	if themes, err := getThemes(i); err != nil {
 		errs = append(errs, err.Error())
 	} else {
+		rand.Shuffle(len(themes), func(i, j int) {
+			themes[i], themes[j] = themes[j], themes[i]
+		})
+
 		for _, tdir := range themes {
 			var authors []string
 			var intro string