Better handling for single plans (but offers multiple site tiers) about pricing-page

[vovafeldman]

@bfintal:

1. The adjustment of the title is already implemented in this PR, it is still in code review, but it would be great if you can check if it works on your end as expected.
2. In this design we decided to default to monthly increments, to show smaller numbers, even if you don't sell monthly. It is better from a CRO perspective since it's easier to commit when seeing smaller numbers. Would you still want to show in annual increments? We don't have that flag/option but we can add it if there's a need.
3. If you can share a mockup of what colors would you like to tweak, that would be helpful.
4. That's something that we won't be able to support right away since it requires adjustments of the storage, etc.

[vovafeldman]

1st bullet address here