Remove archived docs

[ChenYi015]

Purpose of this PR

Proposed changes:

• The archived docs in archived/docs is out of date and unused, we should remove it.

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

[google-oss-prow]

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