Updates Hub docs based on the new changes of Hub v1.8.0

[PuneetPunamiya]

Signed-off-by: Puneet Punamiya [email protected]

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[piyush-garg]

@PuneetPunamiya

1. Do we still need the config update part with the login setup?
2. Can you please add/update docs for catalog refresh also?
3. Can you please remove the docs for the initial resource population step if we don't require them anymore?

[piyush-garg]

/hold

[piyush-garg]

/lgtm /hold cancel