fix(fox): replace camunda with fox namespace in failedJobRetryTimeCycle examples

related to CAM-1358
feat(user-guide): add modeler chapter

 - related to cam-1516
improve(enterprise): add latest download links

 - related to cam-1353
fix(user-guide): fix image reference
feat(enterprise): add new modeler version 7.5.0

Closes: #CAM-1517
upd(modeler): remove activiti

related to #CAM-1516
Update 20-setup-the IDE.html.md
chore(REST/job): Expand docs to job query

related to CAM-1459, CAM-1460
feat(REST/jobDef): Provide docs for job definition query

related to CAM-1460