Map update, take 2

Hi @jwhite66 @piebob @aaronlifshin,
Following procedure, here's my fix for the problem pointed out in #101.

So this PR does the following:
- reverts the previous revert, effectively reapplying the PR of @jueyang
- Fixes the problem I noticed (non-ssl links for leaflet data)
- Removes an unused javascript file from the original PR

You can see the updated map here: https://brad.github.io/homepage_redesign/your-donations/
Please ignore missing image icons on the right and in the footer, those are just caused by using the different github.io url.