Merging Requirements and Getting Started page

[OfficePop]

Merging requirements.md content into getting-started per kubeflow/website issue 845. Changes are as follows:

1. Contents from requirements.md were added to getting-started.md. Slight changes to sub-heading information.
2. Requirements.md was deleted.
3. A re-direct from requirements.md to getting-started.md was added to _references.

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This change is 

[k8s-ci-robot]

Hi @OfficePop. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[joeliedtke]

/assign

[joeliedtke]

Thanks for working on this issue.

[joeliedtke]

I think it would be helpful to give users an introduction to what this page does. How about something like:

This document provides information about setting up Kubeflow in various environments.

[OfficePop]

Thanks for the suggestion! I've updated with a commit covering this comment and the next two as well.

[joeliedtke]

Before this sentence it would be good to give this a section header. How about something like:

Before you begin

I would also recommend updating this sentence, since its context has changed. How about something like:

Before you set up your Kubeflow system, it is important to have some knowledge of the following systems and tools:

[joeliedtke]

Assuming that you add a heading similar to "Before you begin", I would recommend adding a # to make this header an H3.

[sarahmaddox]

/ok-to-test

[sarahmaddox]

Thanks @OfficePop for this update and @joeliedtke for the review!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sarahmaddox

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