allow subpath configuration

[bputt-e]

It would be great if ratel supported sub paths. For example, we'd like to serve ratel from mydomain.com/ratel rather than dedicating a subdomain to it.

Could be done via dgraph-ratel -subPath /ratel or something like -baseUrl https://mydomain.com/ratel

[linear]

DGR-894 allow subpath configuration

[github-actions]

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