Add feature to promote assets to a new phase + move countywide toggle + UI tweaks

[smcalilly]

Overview

This PR:

• Closes #146
• Closes #182

Includes some UI tweaks:

• made the phase detail page more tabular-like
• had to make some changes to the asset map page so it could contain the new forms
• used the more semantic section html tag

Demo

Notes

Countywide

How do we want to deal with all the gis calculations when a project is considered "countywide"? This might throw off some of our existing calculations.

Map UI

I'm not in love with this map UI change but I needed to share it and not spend too much time moving things around/spinning my tires trying to get it perfect. We can discuss in our check-in on Monday.

Slow GIS backend

It takes a while to reload upon saving new assets or changing the phase (reason why in the next paragraph), so we might want to add a loading indicator.

The API can take a long time to process because we designed the API to save each geojson feature as a single LocalAsset, instead of saving the entire feature collection as a whole. So anytime any endpoint is called that deals with GIS stuff, it processes each individual local asset for a phase (most notably in the zones signal, in the phase distribution signal and now in the new promote assets serializer which calls those signals). Here's an example of what that data looks like coming from the client.

This backend implementation might be something we'll want to improve because it's been kind of tricky to deal with in a few places? It would be a pain to have to change once it's in production because we'll have to group/recreate all the existing localasset data.

Testing Instructions

• visit https://ccfp-asset-d-feature-pr-fzcqo3.herokuapp.com/projects/phases/edit/2/assets/
• promote the assets to a new phase
• test the countywide toggle

[smcalilly]

@fgregg i made your suggested UI changes, thanks for your input. it feels a lot better.