swh-docs: Add storage sites documentation
Add storage sites documentation [wip]
Indicate where Softwareheritage stores its data, organize by big storage locations:
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Rocquencourt physical machines
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Rocquencourt virtual machines
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Azure-euwest
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Amazon web services
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Object storage is important and gets its own dedicated document
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So do the hypervisors
Also link to the existing Elasticsearch document
Migrated from D2140 (view on Phabricator)