chore: move repo references from lyft -> amundsen

[dorianj]

ref: amundsen-io/amundsen#615
I left the CI badges: they're wrong after the GH actions transition because they
refer to Travis, but they need to be fixed properly separately

Signed-off-by: Dorian Johnson 2020@dorianj.net

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[Golodhros]

LGTM

Thanks for this!!

[feng-tao]

thanks @dorianj !