Namada: Building protocol and cryptography improvements

Improve Namada docs - PR 1: [Update example PFG proposal](https://github.com/anoma/namada-docs/pull/323) - PR 2: [Update IBC relayer guide](https://github.com/anoma/namada-docs/pull/327) - PR 3: [Update update commission and correct vote PFG commands](https://github.com/anoma/namada-docs/pull/328) - PR 4: [Update POS commands](https://github.com/anoma/namada-docs/pull/329) Improve Namada interface - Issue [729](https://github.com/anoma/namada-interface/issues/729) and PR: [Add transaction for notification](https://github.com/anoma/namada-interface/pull/728)