Change job-offer cards to match design

Description

• The job offer cards on the job-offer/manage and job-offer/manage/all pages are now designed in a fashion similar to that in the wireframes

Note: The job-offer/manage/all will be changed to a list view in issue #74 (closed)

Related Issues

• Resolves #73 (closed)

Checklist

• I have added a changelog entry to reflect the significant changes I made.