Integration of the content-publishing-service into the social-app-template

[p5150j]

We would like to wire up the content-publishing-service into the social-app-template.

AC:

• [x] If I am connected (logged in) to the social-app-template I should be able to post media and text content to the larger social web "feed"
• [x] I should be able add images, text, videos to my social feed
• [ ] other... need to groom (might have logic for my posts and others)

Notes:

• This might be tightly coupled to the content-watcher-service
• Lets review the feed UI and the new post component to scope this further as a group
• Other... need to groom

Repos: https://github.com/AmplicaLabs/content-publishing-service