Update install.md

[omerfsen]

What this PR does / why we need it:
To state Isito or Ambassador is required for a normal setup

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

Hi @omerfsen. Thanks for your PR.

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[seldondev]

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[axsaucedo]

Thank you for the contribution Omer - in this case you are linking specifically the auth page (as opposed to the generic istio / ambassador page). The ingress is not necessary to set up seldon core (we do have a smaller number of users running seldon core in closed environments where non-supported ingress are configured), so probably we can leave it out. I do believe ingress is mentioned in the documentation lower down the page. Are there any reasons why the installation below that outlines istio/ambassador with detailed pages are not enough?

[ryandawsonuk]

Would do you reckon to moving the 'Ingress Support' section from https://github.com/SeldonIO/seldon-core/blob/master/doc/source/workflow/install.md further up the page so that it comes before 'Install a specific version'? Currently we've got a paragraph that ends with 'install it with the relevant ingress (ambassador.enabled or istio.enabled) so you are able to send requests (instructions below).' and then 'instructions below' are quite a long way down.