Organize tasks into folders

[alculquicondor]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The list of tasks is quite big at the moment.
It will be easier to navigate if they are organized into categories.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[alculquicondor]

/assign @PBundyra

I hope I didn't miss any redirect

[mimowo]

/lgtm
Thanks, I like the new organization.

I walked through a couple links (reaching every subpage) and all I clicked worked ok.
I guess if there is a broken link we just let users click and someone will find :).

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e884cf47da8ebf023132e102ac48c907bd0b3f5c

[alculquicondor]

/cherry-pick website

[k8s-infra-cherrypick-robot]

@alculquicondor: once the present PR merges, I will cherry-pick it on top of website in a new PR and assign it to you.

In response to this:

/cherry-pick website

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[alculquicondor]

Opened #1898 for flaky test

/retest

[k8s-infra-cherrypick-robot]

@alculquicondor: new pull request created: #1899

In response to this:

/cherry-pick website

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