Update join Slack link to the non expiring link

[mameshini]

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[google-oss-prow]

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[google-oss-prow]

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[jbottum]

/lgtm

thanks!

[thesuperzapper]

@mameshini @jbottum can we please update it to https://www.kubeflow.org/docs/about/community/#kubeflow-slack (rather than using the invited link directly).

As I was saying in #602 (comment), if we change how we do Slack inviting in the future, we will forget about this link otherwise.

[Syulin7]

@mameshini @jbottum can we please update it to https://www.kubeflow.org/docs/about/community/#kubeflow-slack (rather than using the invited link directly).

As I was saying in #602 (comment), if we change how we do Slack inviting in the future, we will forget about this link otherwise.

Agree. I would like to update it.

[mameshini]

Updated and merged [#605] into master