feat: Added new variables - Air Temperature / Heat Index (Average) / Heat Index (Maximum)

[bodom0015]

Problem

New variables have been submitted by @jluiuc: Average Temp + Average Heat Index

These need to be added to the ChiVes map

Approach

• Added the new variables to the ChiVes map
• Recategorized / renamed variables according to shared spreadsheet

How to Test

1. Navigate to https://deploy-preview-129--chicago-env-explorer.netlify.app/map
2. From the Variables list, choose "Air Temperature"
   • You should see the map update with the new values + colors + Legend
3. From the Variables list, choose "Heat Index (Average)"
   • You should see the map update with the new values + colors + Legend
4. From the Variables list, choose "Heat Index (Maximum)"
   • You should see the map update with the new values + colors + Legend

Screenshots

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[mradamcox]

@bodom0015 @jluiuc I'm going to convert this back to a draft until we have the newly requested max heat data.

[bodom0015]

@Makosak @mradamcox @jluiuc I've added the new "Heat Index (Maximum)" variable here

Variable names + categories have also been adjusted according to the spreadsheet :+1:

Marking this as Ready for Review, if anyone has a chance to take a look :)