Country pages: Largest projects table

[OpenOilUG]

• [x] Add heading to table which allows further explanation of the symbols used. We have a key showing fossil fuel but none showing distinction between dense and sparse data projects. Also what %s are %s of.
• [x] Link to new page showing all projects.
• [x] Replace % in Contry overview widget with midpoint emission estimate.
• [x] Make this list downloadable as CSV
• [x] "All projects page" provide fossil fuel type(s) and estimated mid-point annual volumes for each in the table.
• [ ] Largest projects and all projects page should also include latest annual production of fossil fuel, with unit of measurement. (Production: ex: gas 17m3 (year) \n oil 3T (year) fuel volume unit (year). Note 17.5 - this has been implemented on project page e.g. https://dev.fossilfuelregistry.org/projects/br but not in summary of largest 10 projects on country page e.g. https://dev.fossilfuelregistry.org/co2-forecast/br?productionSourceId=2&projectionSourceId=23&reservesSourceId=2&gwp=GWP100
• [x] Change to megaton MT
• [x] 2 significant digits in percent.

Megaton with two decimals

[OpenOilUG]

• [ ] Add heading to table which allows further explanation of the symbols used. We have a key showing fossil fuel but none showing distinction between dense and sparse data projects. Also what %s are %s of.
• [ ] Add latest production data point in two extra columns, as a value and a unit, in a way which shows it grouped to the fossil fuel type.