Fix top nav bar colour and typo in README

[MarcoGorelli]

closes #878

[seldondev]

Hi @MarcoGorelli. Thanks for your PR.

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[ukclivecox]

Thanks. Very much appreciated.

[ukclivecox]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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[ukclivecox]

/ok-to-test

[MarcoGorelli]

Happy to help, thank you for seldon-core!