problem statement: Execution environments options do not match between list and detail screens:

• ee list has Edit, Sync, Use, Delete
• ee detail has Edit, Sync, Use (no Delete)

notes from 11/3 check in w/ UX:

• The readme needs to be wrapped in a card (white background), including the Edit button floating on the right side
• the same goes for the "no readme, add one" screen, and while editing the readme. (already fixed in https://issues.redhat.com/browse/AAH-1113).

acceptance criteria:

• EE list and detail have the same actions
• ReadMe is added into a larger card
• make ReadMe background white