docs(integrations): add etcdfinder to integrations

[m4l1c1ou5]

Add etcdfinder web UI tool to the integrations and tools documentation for etcd versions v3.5, v3.6, and v3.7.

[k8s-ci-robot]

Hi @m4l1c1ou5. Thanks for your PR.

I'm waiting for a etcd-io 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.

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[wendy-ha18]

/ok-to-test

[wendy-ha18]

LGTM, thanks for your contribution @m4l1c1ou5
cc @jberkus for another review and merge

[jberkus]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkus, m4l1c1ou5

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