Migrate older VPN SEO articles to the resource center

[alexgibson]

Description

Now that we we have the VPN resource center in the CMS, we should migrate all VPN related SEO articles to it.

See https://bugzilla.mozilla.org/show_bug.cgi?id=1937863 which is a request from the L10n team to remove/migrate some page translations that are still in Pontoon.

There are also several URLs that are not part of the resource center:

• https://www.mozilla.org/en-US/products/vpn/desktop/
• https://www.mozilla.org/en-US/products/vpn/desktop/windows/
• https://www.mozilla.org/en-US/products/vpn/desktop/mac/
• https://www.mozilla.org/en-US/products/vpn/desktop/linux/
• https://www.mozilla.org/en-US/products/vpn/mobile/
• https://www.mozilla.org/en-US/products/vpn/mobile/ios/
• https://www.mozilla.org/en-US/products/vpn/mobile/android/
• https://www.mozilla.org/en-US/products/vpn/ipad/

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Success Criteria

• All VPN articles are migrated in Wagtail CMS