(activity): Activity Details Page

[brrkrmn]

This issue presents changes required in activity details page for the activity feature.

Checklist:

• Activity details page should be redesigned according to this design.
• Staff members can publish/unpublish/delete an activity
• Educators can edit/delete their own activities.
• Activity details page should list the creators of the activity with their 'educator' roles.
• Clicking on the educator's profile from the activity details page should show their profile with their 'educator' tag
• Each activity should have a unique link that allows the registered and unregistered users to view the activity.