Further improvements

[ehmatthes]

• Get rid of all django warnings.
• Update home page to reflect more recent analysis, through fall 2020.
• Consider moving videos to vimeo or cdn if high bandwidth usage.
• Dates in the Medvejie slide animation jump from 9/18 to 9/20 right at the first critical point. I'm confident the graph is correct, but I don't know where that jump comes from.
• Make sure all plot images in historical examples are the same size.
  • Make them responsive as well?
• Put historical plot images and animations under version control, but not current images.
• Once public, update links to report to point to main branch, not make_public.
• Clean up the style on the next_steps page.
• Clean up the style on the timeline page.
• Make footer a true sticky footer.

[ehmatthes]

• Add a map of the KH watershed.
• On the project timeline, use the Tlingit name for IR Falls.
• Generate multiple sizes of the main plot image, and configure it to render in a more friendly way on phones and tablets. (No need for different sizes, just use <img class="img-fluid">)
• Build admin option to force refresh of current analysis.
  • May want to refresh every 3 min instead of every 6 minutes.