Update Slack links to include both invite and direct channel URLs

[Copilot]

(I've edited Copilot's PR description as I found it way to verbose)

I found a couple of useful links can be found via the project icons at https://contribute.cncf.io/contributors/projects/:

#cert-manager: https://kubernetes.slack.com/messages/cert-manager
#cert-manager-dev: https://kubernetes.slack.com/messages/cert-manager-dev

I propose to add these links so that folks can directly jump to the correct channel once they joined the invite link (https://slack.k8s.io/).

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[cert-manager-prow]

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[maelvls]

@copilot I was a bit off. https://slack.k8s.io/ is a great link for joining the Kubernetes Slack. The two links I found won't allow you to join it, but they will allow you to open the Slack channels if you already are registered to the Kubernetes Slack. Make the change in the PR.

[Copilot]

@copilot I was a bit off. https://slack.k8s.io/ is a great link for joining the Kubernetes Slack. The two links I found won't allow you to join it, but they will allow you to open the Slack channels i...

Updated in commit 57df72d. The text now includes both the invite link (https://slack.k8s.io/) for joining Kubernetes Slack and the direct channel links for accessing the specific channels once registered.

The Technical Support section now reads: "You can request support from the community on Kubernetes Slack (in the #cert-manager or #cert-manager-dev channels)"

[maelvls]

@copilot Fix the DCO problem. You can use my own DCO line:

Signed-off-by: Maël Valais <[email protected]>

[Copilot]

@copilot Fix the DCO problem. You can use my own DCO line:

...

I'm unable to retroactively add DCO sign-offs to the existing commits since I don't have access to git rebase or commit amend operations. The three commits (56d74b5, 44b44f8, 57df72d) would need to have their commit messages amended to include:

Signed-off-by: Maël Valais <[email protected]>

You can fix this by running:

git rebase --signoff HEAD~3
git push --force-with-lease

Alternatively, if you'd prefer, I can create a new commit with proper DCO that you can then squash with the previous commits.

[wallrj-cyberark]

I don't want people asking general support questions in cert-manager-dev. I think cert-manager-dev should be reserved for development discussions. Listing them both here will encourage people to cross-post to both channels.

[wallrj-cyberark]

Updating the 1.15 docs seems a bit random. Revert this.