Drip Content Timezone

**Is your feature request related to a problem? Please describe.**
When the drip content notice for when the next class is available it sets one time and is not dependent on the user's time zone. For example, the site is in California timezone and content becomes available at 9am someone in Maine timezone won't get it until noon in their local time but the notice still says available at 9am.

**Describe the solution you'd like**
Timezone specific notices.

**Describe alternatives you've considered**
Something like this: https://gist.github.com/thomasplevy/82880f0420474fbae392aeca405ac229

No files, tests, or entry points are identified in the issue. Start by reviewing the drip content notice implementation and the linked timezone example, then define how availability times should be rendered for each user's timezone and verify the notice matches the requested local-time behavior.

Written by the indexing model from the issue text.