Refactor progress

[abhidg]

Test download works for

• [x] economic/relative-wealth-index
• [x] epidemiological/dengue/peru
• [x] geospatial/gadm
• [x] meteorological/aphrodite-daily-mean-temp
• [x] meteorological/aphrodite-daily-precip
• [x] meteorological/chirps-rainfall
• [x] meteorological/terraclimate
• [x] sociodemographic/meta-pop-density
• [x] sociodemographic/worldpop-count
• [x] sociodemographic/worldpop-density

Test process works for:

• [ ] #128
• [ ] #130
• [x] geospatial/chirps-rainfall
• [x] geospatial/gadm
• [ ] #126
• [ ] #139
• [ ] #135
• [x] meteorological/chirps-rainfall
• [ ] #142
• [ ] #143

Other tasks:

• [ ] Port plots to refactored architecture
• [ ] Write process tests