Promote /welcome content to root index and update featured images

[TineoC]

Description

This PR promotes the welcome page content to the root index page and updates the featured background images used across the site.

Changes

• Promoted /welcome content to root _index.md
• Archived contributor-summit-2018.jpg (removed from active use)

Related Issues

Closes #614

[k8s-ci-robot]

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[TineoC]

/priority high

[k8s-ci-robot]

@TineoC: The label(s) priority/high cannot be applied, because the repository doesn't have them.

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In response to this:

/priority high

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[tokt]

Thank you for the work on this, given the importance of the frontpage it'd be nice to get input/approval from SIG leads: @mfahlandt @kaslin and @palnabarun.

[jberkus]

Apologies for non-review, problem with my GH notifications. Gonna try to clear out the backlog.

[jberkus]

So, is there discussion somewhere about changing the image? While I appreciate featuring one of my cups, I'm not clear on why the swap.

[TineoC]

So, is there discussion somewhere about changing the image? While I appreciate featuring one of my cups, I'm not clear on why the swap.

https://www.kubernetes.dev/welcome/ is the current background image, so we're not technically changing the image. The image path had to change was required so it's targeting the index page.

[chris-short]

/lgtm

[TineoC]

I would close this one if the majority agreed to move forward with #629. @jberkus @lmktfy