README: FAQ, and restoring files worded as what it does

[firsttris]

Adds a short FAQ to the README, between Documentation and Development, for people deciding whether to install. It covers:

• keeping an existing SnapRAID setup and turning off cron or snapraid-runner
• the Docker or Podman requirement, and SnapRAID 14
• waking disks
• exposing the UI to the internet
• snapraid-daemon, and the fact that the two work together
• independence from the SnapRAID project
• how the project started, with links to POC: SnapRAID API ? amadvance/snapraid#28 and Demo that looks like a real array, and the README pictures from it #29

Two feature lines are reworded to say what they actually do:

• "Recover deleted or encrypted files" read as if SnapRAID decrypted files. It now says deleted and changed files are restored from parity to their state at the last sync.
• The sync guard line now describes the rule, a scheduled sync is skipped when too many files were deleted or changed, instead of naming ransomware.

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https://claude.ai/code/session_01JuXnquCPdbG5sBbDyin7yF

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