Collect statistics on views

[thekid]

This PR collects sum of views on content and journey entries, and displays them in the feed.

Measurement

For a view to be counted:

• The user must have been on a journey page for 10 seconds
• The user must have been on a content page with:
  • 1 image: for 1.5 seconds
  • 2 images: for 3 seconds
  • 3 images: for 4.5 seconds
  • 4 and more images: for 5 seconds

This is implemented via window.setTimeout() - this will exclude search engine bots, which would (to my knowledge) not execute that.

Every view is counted, refreshing a page and waiting for the above time span will increase the counter one more.

Visualization

No views yet:

One view:

More than one view: