Add a note directing users to KubeVirt's main repo for technical issues.

[stu-gott]

What this PR does / why we need it:

Add a note to the issue filing template to redirect users with technical issues to kubevirt/kubevirt

Does this PR fix any issue? _(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged)_:

Fixes https://github.com/kubevirt/kubevirt.github.io/issues/870

Special notes for your reviewer:

[cwilkers]

Well, I stand corrected (I thought I needed to go into settings for the repo to edit this template)

/lgtm /approve

Thanks @stu-gott !

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cwilkers

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubevirt/kubevirt.github.io/blob/main/OWNERS)~~ [cwilkers] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment