feat(tax-rate)!: Add tax rate

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Add the tax rate to the frontend

Backend: beabee-communityrm/beabee#397

[wpf500]

Can you move the tax rate setting from the membership builder into the settings? It can just go here under a new heading ("Payment"?)

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Can you move the tax rate setting from the membership builder into the settings? It can just go here under a new heading ("Payment"?)

sure

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@wpf500 I have moved the tax settings to the general settings page on this branch. I think now the data should also be stored there in the database and no longer in join content, or what do you think?

[wpf500]

I think this PR doesn't add the tax rate to the join form right? Just the admin side?

[JumpLink]

I think this PR doesn't add the tax rate to the join form right? Just the admin side?

Yes, I think the join part can be implemented together with new UX design, or should I add the tax also to the current to be able to ship this without the new join UX flow?