Best Practices for Ethereum developers on BOS (#1554)

* feat: BOS for Ethereum developers draft

* Update intro.md

* Update docs/bos/ethereum/intro.md

* fix: id updated
feat: sidebar menu

* fix: filename updated

* Apply suggestions from code review

* fix: placeholder doc deleted

* Update bos-ethersjs.md

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* Update bos-ethers-data.md

* feat: Best Practices for Ethereum developers on BOS

* Update docs/bos/tutorial/bos-ethersjs.md

Co-authored-by: Damián Parrino <[email protected]>

* Update docs/bos/tutorial/bos-ethersjs-best-practices.md

Co-authored-by: Damián Parrino <[email protected]>

* Apply suggestions from code review

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Co-authored-by: Miao Jiang <[email protected]>
Co-authored-by: Damián Parrino <[email protected]>