website: update (but not set) archive banner for 1.10 branch

[thesuperzapper]

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Description of your changes:

This is a back port of #4119 to the v1.10-branch, so that we only have to set the archived_version=true flag when we release 1.11 (and want to add the archive banner to the 1.10 branch.

NOTE: this does NOT add the banner right now to the 1.10 branch, it just makes it a single config to turn it on when we want to in the future (see the preview to confirm).

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[thesuperzapper]

@varodrig this is important to make sure we add the correct archive banner on the 1.10 branch (when we decide to do it).

Also, it's important we update the top right to show the current version as 1.10 on the 1.10 branch.

[varodrig]

looks good and I see 1.10