feat: introduce FAQ for installation of Global DR (#157)

[IceCodeNew]

• feat: introduce FAQ for installation of Global DR

• chore: instructions on restarting ES

• chore: refine the prerequisites of LB part

• chore: favored style of naming nodes

• feat: Strong warnings about the MUST-DO while installing the DR env

• chore: apply suggestions of coderabbitai

• fix: typo

• security: restrict file permission of encryption-provider.conf

• fix: Wording is awkward 🥹

• fix: ${i} won’t expand

• chore: wordy

• fix: avoid indistinct instructions

• fix: redundant instructions; reword

• fix: ensure the admin usr of standby cluster is set to the same

• fix: bug

• fix: switch to the root user

[coderabbitai]

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