Update get-job-information.md

added preview_url
Update list-jobs.md

added preview_url
Create preview-output

Created new API article for preview, since it is independent. If agrred after review, then I will add the new API to the list on main page
Rename preview-output to preview-output.md
Create test_announce.md
Update xplenty-typical-workflow.md

Added step 6 to preview job output
Update get-job-information.md

Remove unnecessary commas on last line, url, of outputs
Update list-jobs.md

Removed unnecessary comments from last line, url, of outputs
Delete test_announce.md
Update xplenty-typical-workflow.md

corrected step numbering
Update get-job-information.md

added reference to preview output
merged changes