source citation for charts

[derekeder]

Overview

Adds "Source" citations to the home page map, as well as for the charts on the state detail pages.

Closes #132

Demo

Testing Instructions

• view the home page and confirm you see the source below the map legend
• on the state detail page, confirm you see the source for emissions over time, the emissions breakdown on the left, and under each of the smaller bar charts for each section
• confirm it looks good on mobile as well

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[vkoves]

@derekeder - should we move the citation data into a constant, so it's together with the actual data sources? I suggested to Robert making a combined object in this comment: https://github.com/chihacknight/decarbonize-my-state/issues/132#issuecomment-1229232296

That would prevent us updating one page and not the other

[vkoves]

@derekeder - pinging you on my comment above - I'd like to see us move to a common object before this is merged

[derekeder]

@vkoves ok took care of your comments. We now have a source-citations.js constants file and two helper methods: getShortCitation and getLongCitation. All source citings, including the about page, now use this.

[derekeder]