Add a button on "Add Domain" page labeled "Update Keys" to update the new SSL Keys

Description

As mentioned in Issue #1546 at gitlab.com support tracker,

Problem:

In gitlab.com web interface > Project >Pages, there is no option to update the SSL keys generated by sslforfree.com for an already existing domain in Gitlab project pages. The only buttons are "Details" & "Remove". Current workaround is to remove the domain & re-add it, & add new keys while doing that.

Proposal

Please add a button "Update Keys" in between "Details" & "Remove", with same style as "Details"'s one

This button will load the page same as "Add Domain" does, but with prefilled values of Certificate & Other Keys (Three Big Text Boxes).

Upon submitting, it will verify (& act same as existing Add Domain Page) all data, but instead of new entry in database, it will update the existing entry with keys value of already existing domain. Remember? we are updating the domain SSL Keys?

Links / references

Add Domain Page -> Project -> Gear Icon - Pages -> Add Domain

As suggested by @gitlab Twitter a/c at https://twitter.com/gitlab/status/832251795212746753

Proof Of Concept