Update Simple Staking

website/docs/tools/simpleStaking.md

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website/static/img/simple-staking/connect-forget.png

...ite/static/img/simple-staking/connect-generate-wallet.png

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website/static/img/simple-staking/connect-import.png

...ite/static/img/simple-staking/connect-recovery-phrase.png

website/static/img/simple-staking/connect-wallet-found.png

website/static/img/simple-staking/finish.png

website/static/img/simple-staking/input-amount-unstake.png

website/static/img/simple-staking/input-amount.png

website/static/img/simple-staking/landing-no-wallet.png

...e/static/img/simple-staking/nominate-confirm-password.png

website/static/img/simple-staking/nominate-selecting.png

website/static/img/simple-staking/nominate-show.png

website/static/img/simple-staking/nominate-submit.png

website/static/img/simple-staking/select.png

website/static/img/simple-staking/sign.png