create dot address for cowork

it's time to receive funds for covering operations

- [ ] generate keys, best store it good way to not lost them
- [ ] do we want to use https://github.com/ChainSafe/Multix
- [ ] put on web to payment options, probably payment options could be dedicated section later on - https://subwork.xyz/membership.html#payment-options

Review the checklist and the linked Multix project first, then inspect membership.html#payment-options. Clarify the key-storage and Multix decisions before changing the payment options section. Done means the operations address is available through the site and the selected custody and payment details are documented.

Written by the indexing model from the issue text.