Delete some outdated documentation

[kkkk666]

https://docs.babylonlabs.io/stakers/btc_stakers/btc_staking_tools/
For ordinary stakers, this is the most practical entry point for “where to use it and what to use,” which is a different level of information from a “how-to” guide. Keeping it makes it easier for users to discover options and make decisions.

https://docs.babylonlabs.io/stakers/btc_stakers/liquid_staking/liquid_staking_tokens/
As a concept page under the Liquid Staking subcategory, it’s very useful—recommended to keep it.

https://docs.babylonlabs.io/stakers/btc_stakers/native_staking/unbonding_via_cli/
Delete the part of the phase1 unbonding.

https://docs.babylonlabs.io/stakers/btc_stakers/native_staking/unbonding_via_web/
https://docs.babylonlabs.io/stakers/btc_stakers/native_staking/web_staking/
Delete these two pages

https://docs.babylonlabs.io/stakers/btc_stakers/native_staking/custody_support/
My suggestion is that we could consider removing it, as the staking is no longer our promoted product.

https://docs.babylonlabs.io/stakers/btc_stakers/native_staking/staking_via_cli/
Delete this page

https://docs.babylonlabs.io/category/babylon-wallet-integration/
https://docs.babylonlabs.io/developers/bitcoin_staking/wallet_integration/bitcoin_wallet_integration/
Move all the content of this subpage to a single page.

https://docs.babylonlabs.io/developers/babylon_genesis_chain/node_information/
Remove the nodestake section. nodes.guru will be deleted by the end of March. Remove the genesis devnet section.