Add GeoJSON and All-Products download options

[jeremyh]

Yaml downloads

Add paths to download all products/metadata-types as a single yaml file:

• All Product definitions: http://explorer.example/products.odc-product.yaml
• All Metadata Type definitions: http://explorer.example/metadata-types.odc-type.yaml

So people can, for example, clone remote datacube config in two commands:

datacube type add http://explorer.test/metadata-types.odc-type.yaml
datacube product add http://explorer.test/products.odc-product.yaml

GeoJSON downloads

Add links in the sidebar to download the displayed product extents as GeoJSON files:

(People have asked for these on Slack, as well as for DEA's product coverage as a shape)

[codecov]

Codecov Report

Merging #298 (3055b5c) into develop (1156364) will increase coverage by 0.05%.
The diff coverage is 96.42%.

@@             Coverage Diff             @@
##           develop     #298      +/-   ##
===========================================
+ Coverage    86.74%   86.80%   +0.05%     
===========================================
  Files           24       24              
  Lines         2958     2978      +20     
===========================================
+ Hits          2566     2585      +19     
- Misses         392      393       +1     

Impacted Files	Coverage Δ
cubedash/_utils.py	85.51% <92.85%> (+0.05%)	⬆️
cubedash/_api.py	97.36% <100.00%> (+0.30%)	⬆️
cubedash/_product.py	94.05% <100.00%> (+0.37%)	⬆️
cubedash/warmup.py	64.56% <100.00%> (+0.56%)	⬆️

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[alexgleith]

I like it!