Because:
* We want to swap out the Kit QR code image and put it in our CMS, where Strapi is our tried and tested path
* We want to customize text on the "Set password for Sync" screen when users are coming in through a sync service but Send Tab entrypoint
This commit:
* Adds a new 'default' type in Strapi that doesn't rely on any query params, adds the qr code url as a field option and references this instead
* Adds PostVerifySetPassword page to the RelyingParty content-type with necessary fields, for customization via entrypoint
closes FXA-13476
closes FXA-12939