Pensions: the link to Aviva's website has rotted

[CristinaRO]

Section: https://playbook.dxw.com/working-here/pay-pension-and-benefits/#pensions

Rotten tomato link: https://www.aviva.co.uk/retirement/news-views/report/making-sense-of-tax-relief-on-pension-payments/

What should it be replaced with?

Candidates:
https://www.aviva.co.uk/business/workplace-pensions/sme/training-centre/relief-at-source/
https://www.aviva.co.uk/shape-my-future/building-my-savings-articles/pension-tax-relief/

For bonus points:
Include extra information about how to claim back tax from HMRC if you're paying higher rate tax. Aviva only has the tiniest of mentions, in the form of:

If you’re a higher or additional rate taxpayer, you can claim back extra tax relief through self-assessment if you’re paying into a personal pension or a group personal pension. You simply have to make sure you include your pension contributions when you file your self-assessment return each year.

That "simply" is a slap in the faces of a lot of people who don't speak financese.

Dom wrote a bikeshed post about how to do it:
https://bikeshed.dxw.com/2021/01/21/higher-rate-tax-relief-for-pension-contributions/
but that is only accessible to internal folks.

[yndajas]

The link is addressed in #1101, but not the bonus points