Write documentation for the new DNS-over-HTTPS feature

[maelvls]

In #5003, @FlorianLiebhart implemented DNS-over-HTTPS. The use-case and feature are still to be documented in the website before the release of 1.13.

[jetstack-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
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/lifecycle stale

[SgtCoDFish]

/remove-lifecycle stale

[SgtCoDFish]

@maelvls This is the last open issue assigned to the 1.13 milestone which is obviously passed. Was this completed?

In any case, I'll remove it from the 1.13 milestone!

[jetstack-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
/lifecycle stale

[jetstack-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close.
/lifecycle rotten
/remove-lifecycle stale

[cert-manager-bot]

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.
/close

[cert-manager-prow]

@cert-manager-bot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.
/close

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