Update Netherlands with IRENA renewable data (electricitymaps#2406)

* Added IRENA renewable data

* Update README.md

Co-authored-by: Roberta Hunt <roberta.hunt@tmrow.com>

README.md

@@ -287,7 +287,9 @@ Production capacities are centralized in the [zones.json](https://github.com/tmr
 - Nepal
   -List of PowerStations:[PowerStations](https://en.wikipedia.org/wiki/List_of_power_stations_in_Nepal)
   - GIS Map of Reservoir Projects: [GIS_Reservoir](https://www.doed.gov.np/download/GIS-map-of-reservoir-projects.pdf)
-- Netherlands: [ENTSO-E](https://transparency.entsoe.eu/generation/r2/installedGenerationCapacityAggregation/show)
+- Netherlands
+  - Renewables: [IRENA](https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2020/Mar/IRENA_RE_Capacity_Statistics_2020.pdf)
+  - Other: [ENTSO-E](https://transparency.entsoe.eu/generation/r2/installedGenerationCapacityAggregation/show)
 - Nicaragua: [Climatescope](http://global-climatescope.org/en/country/nicaragua/)
 - Norway
   - Hydro: [NVE](https://www.nve.no/energiforsyning/kraftproduksjon/vannkraft/vannkraftdatabase/)

config/zones.json

@@ -3364,16 +3364,16 @@
       ]
     ],
     "capacity": {
-      "biomass": 1280,
+      "biomass": 849,
       "coal": 4000,
       "gas": 15496,
       "geothermal": 0,
-      "hydro": 38,
+      "hydro": 37,
       "hydro storage": 0,
       "nuclear": 486,
       "oil": 0,
-      "solar": 5710,
-      "wind": 4930
+      "solar": 6720,
+      "wind": 4463
     },
     "contributors": [
       "https://github.com/corradio",