DOCS-726 - Repos section for docs

[djw-m]

What Changed?

Repos docs. New section, front page edit with new cross banner section, docs for all repos and download processed. Also includes Repos 1.0 to Repos 2.0 migration guide.

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-5816--edb-docs-staging.netlify.app

[djw-m]

perhaps this is something we'd add later but shouldn't we reference the actual sunset or end of support for 1.0 somewhere?

@ivoryibuaka I would if I knew when and how - We can add it as a note in the migration section (and it should be mentioned when we mail out on this)

[sonotley]

@djw-m @ivoryibuaka we've previously advised 'end of October' for repos 1.0 sunset, so you can include that if you like