Feature/locking bugfixes

• bugfix to properly handle opening old surveys that cannot be edited by an NREN user
• updated introduction text to be more accurate
• migration for the survey model so that its fixes from the past week are visible everywhere

compendium_v2/migrations/surveymodels/survey_model_2022.json

@@ -2940,8 +2940,6 @@
       "title": "Services"
     }
   ],
-  "sendResultOnPageNext": true,
   "showQuestionNumbers": "onPage",
-  "showTOC": true,
   "checkErrorsMode": "onValueChanged"
 }
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