dev -> master release

[wackerow]

Change log

• Update data fetching from Beaconcha.in [Fixes #597] #602 Update data fetching from Beaconcha.in
• Add note on re-staking to withdrawals content #608 Add note on re-staking to withdrawals content
• [Patch] check for array type on beaconcha.in response #611 [Patch] check for array type on beaconcha.in response
• Patch header label #603 Patch header label
• Pre-Shanghai content cleanup #609 Pre-Shanghai content cleanup
• Update key-gen releases and BTEC guide #614 Update key-gen releases and BTEC guide

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[hwwhww]

Hey @wackerow

We released new staking-deposit-cli: https://github.com/ethereum/staking-deposit-cli/releases

Now users can download binaries from the release page. Could you help update the btec page

[wackerow]

@hwwhww Sure can! Will add that before merging this deploy